diff --git a/opendbc_repo/opendbc/car/chrysler/aol_contract.py b/opendbc_repo/opendbc/car/chrysler/aol_contract.py
index 9deb5b5595..63f2ec30c3 100644
--- a/opendbc_repo/opendbc/car/chrysler/aol_contract.py
+++ b/opendbc_repo/opendbc/car/chrysler/aol_contract.py
@@ -20,11 +20,14 @@ def qualified(cp, *, marked_only=False):
       cp.alternativeExperience not in ((CHRYSLER_AOL_EXPERIENCE,) if marked_only else (0, CHRYSLER_AOL_EXPERIENCE))):
     return False
   flags = ChryslerFlags.HIGHER_MIN_STEERING_SPEED | ChryslerFlags.HAS_BSM | ChryslerFlags.STEERING_SPEED_BYPASS
+  jeep = cp.carFingerprint in (CAR.JEEP_GRAND_CHEROKEE, CAR.JEEP_GRAND_CHEROKEE_2019)
+  if jeep:
+    flags |= ChryslerFlags.JEEP_BRAKE_HOLD_AVAILABLE
   expected = (1 if cp.carFingerprint == CAR.RAM_1500_5TH_GEN else
               8 if cp.carFingerprint == CAR.CHRYSLER_PACIFICA_2019_HYBRID and cp.alternativeExperience == 32 else 0)
   return bool(not int(cp.flags) & ~int(flags) and
               cp.safetyConfigs[0].safetyModel == structs.CarParams.SafetyModel.chrysler and
-              int(cp.safetyConfigs[0].safetyParam) == expected and
+              int(cp.safetyConfigs[0].safetyParam) in ((0, 4) if jeep else (expected,)) and
               cp.lateralTuning.which() in (('torque',) if cp.carFingerprint == CAR.RAM_1500_5TH_GEN else ('pid', 'torque')))
 
 
diff --git a/opendbc_repo/opendbc/car/chrysler/brake_hold.py b/opendbc_repo/opendbc/car/chrysler/brake_hold.py
new file mode 100644
index 0000000000..f567c045bd
--- /dev/null
+++ b/opendbc_repo/opendbc/car/chrysler/brake_hold.py
@@ -0,0 +1,25 @@
+"""Optional stock-ACC stop retention for exactly the two Grand Cherokee ports."""
+
+
+def brake_hold_supported(cp):
+  from opendbc.car import structs
+  from opendbc.car.chrysler.values import CAR, ChryslerFlags
+  return bool(cp is not None and cp.brand == "chrysler" and
+              cp.carFingerprint in (CAR.JEEP_GRAND_CHEROKEE, CAR.JEEP_GRAND_CHEROKEE_2019) and
+              cp.flags & ChryslerFlags.JEEP_BRAKE_HOLD_AVAILABLE and cp.pcmCruise and
+              not cp.openpilotLongitudinalControl and not cp.passive and not cp.dashcamOnly and not cp.notCar and
+              len(cp.safetyConfigs) == 1 and cp.safetyConfigs[0].safetyModel == structs.CarParams.SafetyModel.chrysler and
+              cp.safetyConfigs[0].safetyParam in (0, 4))
+
+
+def apply_brake_hold(cp, requested):
+  if brake_hold_supported(cp):
+    cp.safetyConfigs[0].safetyParam = 4 if requested else 0
+
+
+def create_das_3_command(packer, counter_offset, brake_decel, das_3):
+  values = das_3.copy()
+  values.update(ACC_AVAILABLE=1, ACC_ACTIVE=1, ACC_GO=0, ACC_STANDSTILL=0, ACC_DECEL_REQ=1,
+                ACC_DECEL=brake_decel, ACC_BRK_PREP=0, ENGINE_TORQUE_REQUEST_MAX=0, GR_MAX_REQ=2,
+                COUNTER=(int(das_3["COUNTER"]) + counter_offset) % 16)
+  return packer.make_can_msg("DAS_3", 0, values)
diff --git a/opendbc_repo/opendbc/car/chrysler/carcontroller.py b/opendbc_repo/opendbc/car/chrysler/carcontroller.py
index ea4815c75d..b3e5c2a072 100644
--- a/opendbc_repo/opendbc/car/chrysler/carcontroller.py
+++ b/opendbc_repo/opendbc/car/chrysler/carcontroller.py
@@ -1,8 +1,12 @@
+import os
+import time
+
 from opendbc.can import CANPacker
 from opendbc.car import Bus, DT_CTRL
 from opendbc.car.lateral import apply_meas_steer_torque_limits
 from opendbc.car.chrysler import chryslercan
 from opendbc.car.chrysler.aol_contract import qualified as aol_qualified
+from opendbc.car.chrysler.brake_hold import brake_hold_supported, create_das_3_command
 from opendbc.car.chrysler.values import CUSW_CARS, RAM_CARS, RAM_DT, CarControllerParams, ChryslerFlags
 from opendbc.car.structs import CarState
 from opendbc.car.interfaces import CarControllerBase
@@ -17,6 +21,11 @@ class CarController(CarControllerBase):
     self.last_lkas_falling_edge = 0
     self.lkas_control_bit_prev = False
     self.last_button_frame = 0
+    self.jeep_hold_replay = "REPLAY" in os.environ
+    self.jeep_decel = -2.0
+    self.last_das_3_counter = -1
+    self.jeep_hold_cancelled = False
+    self.jeep_cruise_was_active = False
 
     self.packer = CANPacker(dbc_names[Bus.pt])
     self.params = CarControllerParams(CP)
@@ -100,6 +109,14 @@ class CarController(CarControllerBase):
       if _projection is not None:
         _projection.emit('chrysler.LKAS_COMMAND', apply_torque, lkas_control_bit, can_sends[-1])
 
+    if brake_hold_supported(self.CP) and self.CP.safetyConfigs[0].safetyParam == 4:
+      withdraw = bool(aol_qualified(self.CP, marked_only=True) and CS.aol_pause_longitudinal and
+                      0 < CS.aol_pause_longitudinal_stamp_ns <= now_nanos and
+                      now_nanos - CS.aol_pause_longitudinal_stamp_ns <= 30_000_000)
+      self.update_jeep_brake_hold(CC, CS, now_nanos, can_sends, withdraw=withdraw)
+    else:
+      CS.brake_hold = False
+
     self.frame += 1
 
     new_actuators = CC.actuators.as_builder()
@@ -109,3 +126,43 @@ class CarController(CarControllerBase):
     if _projection is not None:
       _projection.finish(new_actuators.torque)
     return new_actuators, can_sends
+
+  def update_jeep_brake_hold(self, CC, CS, now_nanos, can_sends, *, withdraw=False):
+    # CAN Event/parser timestamps are BOOTTIME. Card passes MONOTONIC for
+    # ordinary live Chrysler controllers, and original CAN time during replay.
+    # Select the established replay contract explicitly; never infer an offset
+    # or renew the parser's original source timestamp at command time.
+    now_boot_ns = now_nanos if self.jeep_hold_replay else time.clock_gettime_ns(time.CLOCK_BOOTTIME)
+    if (not CS.das_3 or not CS.out.canValid or CS.out.canTimeout or
+        not 0 <= now_boot_ns - CS.das_3_timestamp <= 100_000_000):
+      CS.brake_hold = False
+      return
+    counter = int(CS.das_3["COUNTER"])
+    changed = counter != self.last_das_3_counter
+    self.last_das_3_counter = counter
+    active = CS.out.cruiseState.enabled
+    if active and not self.jeep_cruise_was_active:
+      self.jeep_hold_cancelled = False
+    self.jeep_cruise_was_active = active
+    if CC.cruiseControl.cancel or CS.jeep_driver_cancel or withdraw:
+      self.jeep_hold_cancelled = True
+    if self.jeep_hold_cancelled:
+      CS.brake_hold = False
+      return
+    decel = float(CS.das_3["ACC_DECEL"])
+    if not CS.brake_hold and CS.out.cruiseState.enabled and decel < -0.5 and CS.out.standstill:
+      CS.brake_hold = True
+      self.jeep_decel = -2.0
+    if (CC.cruiseControl.cancel or CS.jeep_driver_cancel or withdraw or CS.out.gasPressed or CS.out.brakePressed or
+        CS.out.gearShifter != CarState.GearShifter.drive or not CS.out.standstill or
+        not CS.out.cruiseState.available or CS.out.accFaulted):
+      CS.brake_hold = False
+      return
+    if not CS.brake_hold:
+      return
+    if CS.out.cruiseState.enabled:
+      self.jeep_decel = max(-3.0, min(-0.5, min(self.jeep_decel, decel)))
+      return
+    can_sends.append(create_das_3_command(self.packer, 2 if changed else 3, self.jeep_decel, CS.das_3))
+    if self.frame % 10 == 0:
+      can_sends.append(chryslercan.create_cruise_buttons(self.packer, CS.button_counter + 1, 0, resume=True))
diff --git a/opendbc_repo/opendbc/car/chrysler/carstate.py b/opendbc_repo/opendbc/car/chrysler/carstate.py
index 028cde345a..f1974f63f0 100644
--- a/opendbc_repo/opendbc/car/chrysler/carstate.py
+++ b/opendbc_repo/opendbc/car/chrysler/carstate.py
@@ -27,6 +27,10 @@ class CarState(CarStateBase):
     self.aol_pause_longitudinal = False
     self.aol_pause_longitudinal_stamp_ns = 0
     self.aol_buttons = {ButtonType.mainCruise: 0, ButtonType.cancel: 0}
+    self.brake_hold = False
+    self.das_3 = {}
+    self.das_3_timestamp = 0
+    self.jeep_driver_cancel = False
 
   def update(self, can_parsers) -> structs.CarState:
     cp = can_parsers[Bus.pt]
@@ -84,6 +88,11 @@ class CarState(CarStateBase):
     ret.cruiseState.nonAdaptive = cp_cruise.vl["DAS_4"]["ACC_STATE"] in (1, 2)  # 1 NormalCCOn and 2 NormalCCSet
     ret.cruiseState.standstill = cp_cruise.vl["DAS_3"]["ACC_STANDSTILL"] == 1
     ret.accFaulted = cp_cruise.vl["DAS_3"]["ACC_FAULTED"] != 0
+    if self.CP.flags & ChryslerFlags.JEEP_BRAKE_HOLD_AVAILABLE:
+      self.das_3 = dict(cp_cruise.vl["DAS_3"])
+      self.jeep_driver_cancel = bool(cp.vl["CRUISE_BUTTONS"]["ACC_Cancel"])
+      self.das_3_timestamp = cp_cruise.ts_nanos["DAS_3"]["COUNTER"]
+      ret.brakeHoldActive = self.brake_hold
 
     if self.CP.carFingerprint in RAM_CARS:
       # Auto High Beam isn't Located in this message on chrysler or jeep currently located in 729 message
diff --git a/opendbc_repo/opendbc/car/chrysler/interface.py b/opendbc_repo/opendbc/car/chrysler/interface.py
index 4bf4be16ff..c91f2537f9 100755
--- a/opendbc_repo/opendbc/car/chrysler/interface.py
+++ b/opendbc_repo/opendbc/car/chrysler/interface.py
@@ -57,6 +57,7 @@ class CarInterface(CarInterfaceBase):
 
     elif candidate in (CAR.JEEP_GRAND_CHEROKEE, CAR.JEEP_GRAND_CHEROKEE_2019):
       ret.steerActuatorDelay = 0.2
+      ret.flags |= ChryslerFlags.JEEP_BRAKE_HOLD_AVAILABLE.value
 
       ret.lateralTuning.init('pid')
       ret.lateralTuning.pid.kpBP, ret.lateralTuning.pid.kiBP = [[9., 20.], [9., 20.]]
diff --git a/opendbc_repo/opendbc/car/chrysler/tests/test_jeep_brake_hold.py b/opendbc_repo/opendbc/car/chrysler/tests/test_jeep_brake_hold.py
new file mode 100644
index 0000000000..a00a94b501
--- /dev/null
+++ b/opendbc_repo/opendbc/car/chrysler/tests/test_jeep_brake_hold.py
@@ -0,0 +1,235 @@
+"""Real Jeep parser/controller stock-stop retention; no system speed authority."""
+
+import os
+import unittest
+from unittest.mock import patch
+from opendbc.can import CANPacker, CANParser
+from opendbc.car import Bus, gen_empty_fingerprint, structs
+from opendbc.car.chrysler.brake_hold import apply_brake_hold, brake_hold_supported
+from opendbc.car.chrysler.interface import CarInterface
+from opendbc.car.chrysler.values import CAR, DBC
+
+
+def params(candidate=CAR.JEEP_GRAND_CHEROKEE, *, enabled=True):
+  cp = CarInterface.get_params(candidate, gen_empty_fingerprint(), [], False, False, False)
+  apply_brake_hold(cp, enabled)
+  return cp
+
+
+class PhysicalCan:
+  def __init__(self, ci):
+    ci.update([])
+    self.ci = ci
+    self.packers = {bus: CANPacker(parser.dbc.name) for bus, parser in ci.can_parsers.items()}
+
+  def frames(self, tick, *, active=True, decel=-2.0, main=True, gas=0.0, brake=0, speed=0.0, gear=4, fault=0, omit=()):
+    values = {
+      'DAS_3': {
+        'ACC_ACTIVE': int(active),
+        'ACC_AVAILABLE': int(main),
+        'ACC_DECEL': decel,
+        'ACC_STANDSTILL': 1,
+        'ACC_FAULTED': fault,
+        'ENGINE_TORQUE_REQUEST': 13.25,
+        'DISABLE_FUEL_SHUTOFF': 1,
+        'COLLISION_BRK_PREP': 1,
+        'COUNTER': (14 + tick // 2) % 16,
+      },
+      'DAS_4': {'ACC_SET_SPEED_KPH': 100, 'ACC_STATE': 3},
+      'GEAR': {'PRNDL': gear},
+      'ECM_5': {'Accelerator_Position': gas},
+      'ESP_1': {'Brake_Pedal_State': brake},
+      'SPEED_1': {'SPEED_LEFT': speed, 'SPEED_RIGHT': speed},
+    }
+    return [
+      self.packers[bus].make_can_msg(parser.dbc.addr_to_msg[address].name, parser.bus, values.get(parser.dbc.addr_to_msg[address].name, {}))
+      for bus, parser in self.ci.can_parsers.items()
+      for address in sorted(parser.addresses)
+      if parser.dbc.addr_to_msg[address].name not in omit
+    ]
+
+
+def apply_at_boot(ci, command, now):
+  with patch('opendbc.car.chrysler.carcontroller.time.clock_gettime_ns', return_value=now):
+    return ci.apply(command.as_reader(), now)
+
+
+class TestJeepBrakeHold(unittest.TestCase):
+  def setUp(self):
+    prior = os.environ.pop('REPLAY', None)
+
+    def restore():
+      if prior is None:
+        os.environ.pop('REPLAY', None)
+      else:
+        os.environ['REPLAY'] = prior
+
+    self.addCleanup(restore)
+
+  def ready(self, candidate=CAR.JEEP_GRAND_CHEROKEE):
+    ci = CarInterface(params(candidate))
+    stream = PhysicalCan(ci)
+    cc = structs.CarControl(enabled=True)
+    for tick in range(20):
+      ci.update([(100_000_000_000 + tick * 10_000_000, stream.frames(tick))])
+      apply_at_boot(ci, cc, 100_000_000_000 + tick * 10_000_000)
+    self.assertTrue(ci.CS.out.canValid and ci.CS.brake_hold)
+    return ci, stream, cc
+
+  def test_two_exact_platforms_stock_ownership_default_off_and_siblings(self):
+    for candidate in CAR:
+      for release in (False, True):
+        cp = CarInterface.get_params(candidate, gen_empty_fingerprint(), [], True, release, False)
+        expected = candidate in (CAR.JEEP_GRAND_CHEROKEE, CAR.JEEP_GRAND_CHEROKEE_2019)
+        self.assertEqual(brake_hold_supported(cp), expected)
+        before = cp.to_dict()
+        apply_brake_hold(cp, True)
+        self.assertEqual(cp.safetyConfigs[0].safetyParam, 4 if expected else before['safetyConfigs'][0]['safetyParam'])
+        self.assertFalse(cp.openpilotLongitudinalControl)
+        self.assertTrue(cp.pcmCruise)
+        apply_brake_hold(cp, False)
+        self.assertEqual(cp.to_dict(), before)
+
+  def test_real_parser_copied_fields_decel_counter_wrap_and_repeat(self):
+    for candidate in (CAR.JEEP_GRAND_CHEROKEE, CAR.JEEP_GRAND_CHEROKEE_2019):
+      ci, stream, cc = self.ready(candidate)
+      decoder = CANParser(DBC[candidate][Bus.pt], [('DAS_3', 0)], 0)
+      for tick in range(20, 55):
+        now = 100_000_000_000 + tick * 10_000_000
+        previous = ci.CC.last_das_3_counter
+        ci.update([(now, stream.frames(tick, active=False))])
+        _, frames = apply_at_boot(ci, cc, now)
+        hold = [frame for frame in frames if frame[0] == 0x1F4]
+        self.assertEqual(len(hold), 1)
+        decoder.update([(now, hold)])
+        parsed = decoder.vl['DAS_3']
+        stock = ci.CS.das_3
+        self.assertEqual(parsed['COUNTER'], (int(stock['COUNTER']) + (2 if int(stock['COUNTER']) != previous else 3)) % 16)
+        for name in ('ENGINE_TORQUE_REQUEST', 'DISABLE_FUEL_SHUTOFF', 'COLLISION_BRK_PREP', 'ACC_FAULTED'):
+          self.assertEqual(parsed[name], stock[name])
+        for name, expected in {
+          'ACC_ACTIVE': 1,
+          'ACC_AVAILABLE': 1,
+          'ACC_GO': 0,
+          'ACC_STANDSTILL': 0,
+          'ACC_DECEL_REQ': 1,
+          'GR_MAX_REQ': 2,
+          'ACC_BRK_PREP': 0,
+          'ENGINE_TORQUE_REQUEST_MAX': 0,
+        }.items():
+          self.assertEqual(parsed[name], expected)
+        self.assertAlmostEqual(parsed['ACC_DECEL'], -2.0, delta=0.004885)
+        resumes = [frame for frame in frames if frame[0] == 0x23B]
+        self.assertEqual(bool(resumes), tick % 10 == 0)
+
+  def test_driver_main_fault_and_source_withdrawal(self):
+    for stimulus in ('gas', 'brake', 'speed', 'gear', 'main', 'fault', 'cancel', 'stale'):
+      ci, stream, cc = self.ready()
+      args = (
+        {stimulus: {'gas': 1.0, 'brake': 1, 'speed': 1.0, 'gear': 1, 'main': False, 'fault': 1}.get(stimulus)} if stimulus not in ('cancel', 'stale') else {}
+      )
+      now = 100_200_000_000
+      if stimulus == 'cancel':
+        cc.cruiseControl.cancel = True
+      ci.update([(now, stream.frames(20, active=False, **args))])
+      if stimulus == 'stale':
+        now += 100_000_001
+      _, frames = apply_at_boot(ci, cc, now)
+      self.assertFalse(ci.CS.brake_hold, stimulus)
+      self.assertFalse(any(frame[0] == 0x1F4 for frame in frames), stimulus)
+
+  def test_stock_braking_strength_clamped_to_original_envelope(self):
+    ci, stream, cc = self.ready()
+    for tick in range(20, 30):
+      now = 100_000_000_000 + tick * 10_000_000
+      ci.update([(now, stream.frames(tick, decel=-4.0))])
+      apply_at_boot(ci, cc, now)
+    self.assertEqual(ci.CC.jeep_decel, -3.0)
+
+  def test_real_parser_crc_fault_withdraws_hold(self):
+    ci, stream, cc = self.ready()
+    for tick in range(20, 32):
+      now = 100_000_000_000 + tick * 10_000_000
+      frames = stream.frames(tick, active=False)
+      for index, (address, data, bus) in enumerate(frames):
+        if address == 0x1F4:
+          invalid = bytearray(data)
+          invalid[-1] ^= 1
+          frames[index] = (address, bytes(invalid), bus)
+      ci.update([(now, frames)])
+      _, emitted = apply_at_boot(ci, cc, now)
+    self.assertGreater(now - ci.CS.das_3_timestamp, 100_000_000)
+    self.assertFalse(ci.CS.brake_hold)
+    self.assertFalse(any(frame[0] == 0x1F4 for frame in emitted))
+
+  def test_commanded_cancel_requires_fresh_stock_acc_engagement(self):
+    ci, stream, cc = self.ready()
+    cc.cruiseControl.cancel = True
+    ci.update([(100_200_000_000, stream.frames(20))])
+    apply_at_boot(ci, cc, 100_200_000_000)
+    cc.cruiseControl.cancel = False
+    for tick in range(21, 25):
+      now = 100_000_000_000 + tick * 10_000_000
+      ci.update([(now, stream.frames(tick))])
+      apply_at_boot(ci, cc, now)
+      self.assertFalse(ci.CS.brake_hold)
+    ci.update([(100_250_000_000, stream.frames(25, active=False))])
+    apply_at_boot(ci, cc, 100_250_000_000)
+    ci.update([(100_260_000_000, stream.frames(26))])
+    apply_at_boot(ci, cc, 100_260_000_000)
+    self.assertTrue(ci.CS.brake_hold)
+
+  def test_actual_factory_default_off_and_siblings_emit_no_hold(self):
+    for candidate in CAR:
+      for requested in (False, True):
+        if requested and candidate in (CAR.JEEP_GRAND_CHEROKEE, CAR.JEEP_GRAND_CHEROKEE_2019):
+          continue
+        ci = CarInterface(params(candidate, enabled=requested))
+        stream = PhysicalCan(ci)
+        cc = structs.CarControl()
+        for tick in range(20):
+          now = 100_000_000_000 + tick * 10_000_000
+          ci.update([(now, stream.frames(tick, active=False))])
+          _, frames = apply_at_boot(ci, cc, now)
+          self.assertFalse(ci.CS.brake_hold)
+          self.assertFalse(any(frame[0] == 0x1F4 for frame in frames))
+
+  def test_actual_parser_reverse_then_drive_does_not_restore_disabled_stock_long(self):
+    ci, stream, cc = self.ready()
+    ci.update([(100_200_000_000, stream.frames(20, active=False, gear=2))])
+    _, frames = apply_at_boot(ci, cc, 100_200_000_000)
+    self.assertEqual(ci.CS.out.gearShifter, structs.CarState.GearShifter.reverse)
+    self.assertFalse(ci.CS.brake_hold)
+    self.assertFalse(any(frame[0] == 0x1F4 for frame in frames))
+    ci.update([(100_210_000_000, stream.frames(21, active=False, gear=4))])
+    _, frames = apply_at_boot(ci, cc, 100_210_000_000)
+    self.assertFalse(ci.CS.brake_hold)
+    self.assertFalse(any(frame[0] == 0x1F4 for frame in frames))
+
+  def test_original_can_boot_age_is_independent_of_controller_monotonic_time(self):
+    ci, stream, cc = self.ready()
+    boot_ns = 100_200_000_000
+    ci.update([(boot_ns, stream.frames(20, active=False))])
+    with patch('opendbc.car.chrysler.carcontroller.time.clock_gettime_ns', return_value=boot_ns):
+      _, frames = ci.apply(cc.as_reader(), boot_ns - 9_000_000_000)
+    self.assertTrue(ci.CS.brake_hold)
+    self.assertTrue(any(frame[0] == 0x1F4 for frame in frames))
+
+  def test_original_boot_source_future_and_stale_are_not_restamped(self):
+    for offset in (-1, 100_000_001):
+      ci, stream, cc = self.ready()
+      source = 100_200_000_000
+      ci.update([(source, stream.frames(20, active=False))])
+      with patch('opendbc.car.chrysler.carcontroller.time.clock_gettime_ns', return_value=source + offset):
+        _, frames = ci.apply(cc.as_reader(), source)
+      self.assertFalse(ci.CS.brake_hold)
+      self.assertFalse(any(frame[0] == 0x1F4 for frame in frames))
+
+  def test_replay_uses_original_can_time_in_the_explicit_replay_domain(self):
+    with patch.dict(os.environ, {'REPLAY': '1'}):
+      ci, stream, cc = self.ready()
+      source = 100_200_000_000
+      ci.update([(source, stream.frames(20, active=False))])
+      with patch('opendbc.car.chrysler.carcontroller.time.clock_gettime_ns', side_effect=AssertionError('no host clock in original-time replay')):
+        _, frames = ci.apply(cc.as_reader(), source)
+      self.assertTrue(any(frame[0] == 0x1F4 for frame in frames))
diff --git a/opendbc_repo/opendbc/car/chrysler/values.py b/opendbc_repo/opendbc/car/chrysler/values.py
index 703c1ad66a..e151b0e284 100644
--- a/opendbc_repo/opendbc/car/chrysler/values.py
+++ b/opendbc_repo/opendbc/car/chrysler/values.py
@@ -13,6 +13,7 @@ class ChryslerSafetyFlags(IntFlag):
   RAM_DT = 1
   RAM_HD = 2
   AOL_PACIFICA_HYBRID_SET_GUARD = 8
+  JEEP_BRAKE_HOLD = 4
 
 
 class ChryslerFlags(IntFlag):
@@ -20,6 +21,7 @@ class ChryslerFlags(IntFlag):
   HIGHER_MIN_STEERING_SPEED = 1
   HAS_BSM = 2  # blind spot monitoring
   STEERING_SPEED_BYPASS = 4
+  JEEP_BRAKE_HOLD_AVAILABLE = 8
 
 
 @dataclass
diff --git a/opendbc_repo/opendbc/safety/modes/chrysler.h b/opendbc_repo/opendbc/safety/modes/chrysler.h
index cc906fb915..b22ac706c7 100644
--- a/opendbc_repo/opendbc/safety/modes/chrysler.h
+++ b/opendbc_repo/opendbc/safety/modes/chrysler.h
@@ -39,6 +39,31 @@ typedef enum {
   CHRYSLER_PACIFICA,  // plus Jeep
 } ChryslerPlatform;
 static ChryslerPlatform chrysler_platform;
+static bool chrysler_jeep_hold;
+static bool chrysler_hold_armed;
+static bool chrysler_hold_cancelled;
+static uint8_t chrysler_hold_stock[8];
+static bool chrysler_hold_drive;
+static bool chrysler_hold_gear_seen;
+static bool chrysler_hold_gear_initialized;
+static uint8_t chrysler_hold_gear_counter;
+static uint32_t chrysler_hold_gear_timestamp;
+static uint32_t chrysler_hold_stock_timestamp;
+
+static bool chrysler_hold_ready(void) {
+  const uint32_t now = microsecond_timer_get();
+  bool healthy = !safety_rx_checks_invalid;
+  for (int i = 0; i < current_safety_config.rx_checks_len; i++) {
+    const RxStatus *status = &current_safety_config.rx_checks[i].status;
+    healthy &= status->msg_seen && status->valid_checksum && status->valid_quality_flag &&
+               status->wrong_counters < MAX_WRONG_COUNTERS && !status->lagging &&
+               safety_get_ts_elapsed(now, status->last_timestamp) <= 1000000U;
+  }
+  return chrysler_jeep_hold && healthy && chrysler_hold_gear_seen && chrysler_hold_drive &&
+         safety_get_ts_elapsed(now, chrysler_hold_gear_timestamp) <= 100000U &&
+         safety_get_ts_elapsed(now, chrysler_hold_stock_timestamp) <= 100000U && acc_main_on && !vehicle_moving && !gas_pressed && !brake_pressed &&
+         ((chrysler_hold_stock[5] & 0xC0U) == 0U);
+}
 
 #define CHRYSLER_ADDR(name) ((uint32_t)((chrysler_platform == CHRYSLER_RAM_DT) ? CHRYSLER_RAM_DT_##name : \
                                         ((chrysler_platform == CHRYSLER_RAM_HD) ? CHRYSLER_RAM_HD_##name : CHRYSLER_##name)))
@@ -62,6 +87,17 @@ static void chrysler_rx_hook(const CANPacket_t *msg) {
   if (msg_matches(msg, CHRYSLER_ADDR(DAS_3), das_3_bus)) {
     bool cruise_engaged = GET_BIT(msg, 21U);
     pcm_cruise_check(cruise_engaged);
+    if (chrysler_jeep_hold) {
+      chrysler_hold_stock_timestamp = microsecond_timer_get();
+      const bool previous_active = (chrysler_hold_stock[2] & 0x20U) != 0U;
+      if (cruise_engaged && !previous_active) { chrysler_hold_cancelled = false; }
+      acc_main_on = GET_BIT(msg, 20U);
+      for (int i = 0; i < 8; i++) { chrysler_hold_stock[i] = msg->data[i]; }
+      const unsigned int raw_decel = ((msg->data[2] & 0xFU) << 8) | msg->data[3];
+      if (chrysler_hold_ready() && !chrysler_hold_cancelled && cruise_engaged && (raw_decel < 3173U)) {
+        chrysler_hold_armed = true;
+      }
+    }
   }
 
   // TODO: use the same message for both
@@ -84,6 +120,29 @@ static void chrysler_rx_hook(const CANPacket_t *msg) {
   if (msg_matches(msg, CHRYSLER_ADDR(ESP_1), 0U)) {
     brake_pressed = ((msg->data[0U] & 0xFU) >> 2U) == 1U;
   }
+  if (chrysler_jeep_hold && !chrysler_hold_ready()) { chrysler_hold_armed = false; }
+}
+
+static void chrysler_hold_cancel_rx(const CANPacket_t *msg) {
+  if (chrysler_jeep_hold && msg_matches(msg, 746U, 0U)) {
+    // GEAR_CHECKSUM has no checksum algorithm in the Chrysler DBC. Require
+    // its known size and advancing counter without inventing a CRC contract.
+    const uint8_t counter = (uint8_t)(msg->data[3] >> 4);
+    const bool valid = (GET_LEN(msg) == 5U) &&
+                       (!chrysler_hold_gear_initialized || counter == ((chrysler_hold_gear_counter + 1U) & 0xFU));
+    chrysler_hold_gear_initialized = true;
+    chrysler_hold_gear_counter = counter;
+    chrysler_hold_gear_seen = valid;
+    chrysler_hold_drive = valid && ((msg->data[0] & 7U) == 4U);
+    if (valid) { chrysler_hold_gear_timestamp = microsecond_timer_get(); }
+    if (!chrysler_hold_ready()) { chrysler_hold_armed = false; }
+  }
+  if (chrysler_jeep_hold && msg_matches(msg, CHRYSLER_CRUISE_BUTTONS, 0U)) {
+    if ((GET_LEN(msg) != 3U) || (chrysler_get_checksum(msg) != chrysler_compute_checksum(msg)) || GET_BIT(msg, 0U)) {
+      chrysler_hold_armed = false;
+      chrysler_hold_cancelled = true;
+    }
+  }
 }
 
 static bool chrysler_tx_hook(const CANPacket_t *msg) {
@@ -135,17 +194,46 @@ static bool chrysler_tx_hook(const CANPacket_t *msg) {
   if (msg->addr == CHRYSLER_ADDR(CRUISE_BUTTONS)) {
     const bool is_cancel = msg->data[0] == 1U;
     const bool is_resume = msg->data[0] == 0x10U;
-    const bool allowed = is_cancel || (is_resume && controls_allowed);
+    if (is_cancel && chrysler_jeep_hold) {
+      chrysler_hold_armed = false;
+      chrysler_hold_cancelled = true;
+    }
+    const bool hold_resume = chrysler_hold_armed && chrysler_hold_ready() && ((chrysler_hold_stock[2] & 0x20U) == 0U) &&
+                             (chrysler_get_checksum(msg) == chrysler_compute_checksum(msg));
+    const bool allowed = is_cancel || (is_resume && (controls_allowed || hold_resume));
     if (!allowed) {
       tx = false;
     }
   }
 
+  if (msg->addr == CHRYSLER_DAS_3) {
+    const unsigned int raw_decel = ((msg->data[2] & 0xFU) << 8) | msg->data[3];
+    const unsigned int stock_counter = chrysler_hold_stock[6] >> 4;
+    const unsigned int counter = msg->data[6] >> 4;
+    tx &= chrysler_hold_armed && chrysler_hold_ready() && ((chrysler_hold_stock[2] & 0x20U) == 0U) &&
+          (raw_decel >= 2661U) && (raw_decel <= 3173U) &&
+          ((counter == ((stock_counter + 2U) & 0xFU)) || (counter == ((stock_counter + 3U) & 0xFU))) &&
+          (msg->data[0] == (chrysler_hold_stock[0] & 0x1FU)) && (msg->data[1] == chrysler_hold_stock[1]) &&
+          ((msg->data[2] & 0xF0U) == ((chrysler_hold_stock[2] & 0x80U) | 0x30U)) &&
+          (msg->data[4] == 0x12U) && (msg->data[5] == (chrysler_hold_stock[5] & 0xC0U)) &&
+          ((msg->data[6] & 0xFU) == (chrysler_hold_stock[6] & 1U)) &&
+          (chrysler_get_checksum(msg) == chrysler_compute_checksum(msg));
+  }
   return tx;
 }
 
 static safety_config chrysler_init(uint16_t param) {
   const uint32_t CHRYSLER_PARAM_RAM_DT = 1U;  // set for Ram DT platform
+  chrysler_jeep_hold = param == 4U;
+  chrysler_hold_armed = false;
+  chrysler_hold_cancelled = false;
+  chrysler_hold_drive = false;
+  chrysler_hold_gear_seen = false;
+  chrysler_hold_gear_initialized = false;
+  chrysler_hold_gear_counter = 0U;
+  chrysler_hold_gear_timestamp = 0U;
+  chrysler_hold_stock_timestamp = 0U;
+  for (int i = 0; i < 8; i++) { chrysler_hold_stock[i] = 0U; }
 
   static RxCheck chrysler_ram_dt_rx_checks[] = {
     {.msg = {{CHRYSLER_RAM_DT_EPS_2, 0, 8, 100U, .max_counter = 15U, .ignore_quality_flag = true}, { 0 }, { 0 }}},
@@ -169,6 +257,13 @@ static safety_config chrysler_init(uint16_t param) {
     {CHRYSLER_DAS_6, 0, 8, .check_relay = true},
   };
 
+  static const CanMsg CHRYSLER_JEEP_HOLD_TX_MSGS[] = {
+    {CHRYSLER_CRUISE_BUTTONS, 0, 3, .check_relay = false},
+    {CHRYSLER_LKAS_COMMAND, 0, 6, .check_relay = true},
+    {CHRYSLER_DAS_6, 0, 8, .check_relay = true},
+    {CHRYSLER_DAS_3, 0, 8, .check_relay = false},
+  };
+
   static const CanMsg CHRYSLER_RAM_DT_TX_MSGS[] = {
     {CHRYSLER_RAM_DT_CRUISE_BUTTONS, 2, 3, .check_relay = false},
     {CHRYSLER_RAM_DT_LKAS_COMMAND, 0, 8, .check_relay = true},
@@ -209,6 +304,7 @@ static safety_config chrysler_init(uint16_t param) {
   } else {
     chrysler_platform = CHRYSLER_PACIFICA;
     ret = BUILD_SAFETY_CFG(chrysler_rx_checks, CHRYSLER_TX_MSGS);
+    if (chrysler_jeep_hold) { SET_TX_MSGS(CHRYSLER_JEEP_HOLD_TX_MSGS, ret); }
   }
   chrysler_aol_configure(param);
   // The allocated Hybrid guard never falls back to ordinary or Ram output.
@@ -219,10 +315,15 @@ static safety_config chrysler_init(uint16_t param) {
   return ret;
 }
 
+static void chrysler_optional_rx(const CANPacket_t *msg) {
+  chrysler_aol_optional_rx(msg);
+  chrysler_hold_cancel_rx(msg);
+}
+
 const safety_hooks chrysler_hooks = {
   .init = chrysler_init,
   .rx = chrysler_rx_hook,
-  .optional_rx = chrysler_aol_optional_rx,
+  .optional_rx = chrysler_optional_rx,
   .tx = chrysler_tx_hook,
   .get_counter = chrysler_get_counter,
   .get_checksum = chrysler_get_checksum,
diff --git a/opendbc_repo/opendbc/safety/modes/chrysler_aol.h b/opendbc_repo/opendbc/safety/modes/chrysler_aol.h
index 9a2de891c7..f2513f2e2c 100644
--- a/opendbc_repo/opendbc/safety/modes/chrysler_aol.h
+++ b/opendbc_repo/opendbc/safety/modes/chrysler_aol.h
@@ -173,7 +173,7 @@ static void chrysler_aol_optional_rx(const CANPacket_t *msg) {
 static void chrysler_aol_configure(uint16_t param) {
   chrysler_aol_reset();
   chrysler_aol_set_guard = param == 8U;
-  chrysler_aol_enabled = (alternative_experience == 32) && ((param == 0U) || (param == 1U) || (param == 8U));
+  chrysler_aol_enabled = (alternative_experience == 32) && ((param == 0U) || (param == 1U) || (param == 4U) || (param == 8U));
   if (chrysler_aol_enabled) {
     static const AolSafetyPolicy policy = {
       .reset = chrysler_aol_reset,
diff --git a/opendbc_repo/opendbc/safety/tests/test_chrysler_jeep_brake_hold.py b/opendbc_repo/opendbc/safety/tests/test_chrysler_jeep_brake_hold.py
new file mode 100644
index 0000000000..d6238c92a2
--- /dev/null
+++ b/opendbc_repo/opendbc/safety/tests/test_chrysler_jeep_brake_hold.py
@@ -0,0 +1,205 @@
+"""Exact opt-in Jeep native retention, physical permission and copied payload."""
+
+import unittest
+from opendbc.can import CANPacker
+from opendbc.car import structs
+from opendbc.car.chrysler.brake_hold import create_das_3_command
+from opendbc.safety.tests.libsafety import libsafety_py
+
+
+class TestJeepBrakeHoldSafety(unittest.TestCase):
+  def setUp(self):
+    self.safety = libsafety_py.libsafety
+
+  def select(self, word=4):
+    self.safety.init_tests()
+    self.safety.set_alternative_experience(0)
+    self.assertEqual(self.safety.set_safety_hooks(structs.CarParams.SafetyModel.chrysler, word), 0)
+    self.packer = CANPacker('chrysler_pacifica_2017_hybrid_generated')
+    self.stock = {
+      'ACC_AVAILABLE': 1,
+      'ACC_ACTIVE': 1,
+      'ACC_STANDSTILL': 1,
+      'ACC_DECEL': -2.0,
+      'ENGINE_TORQUE_REQUEST': 13.25,
+      'DISABLE_FUEL_SHUTOFF': 1,
+      'COLLISION_BRK_PREP': 1,
+      'COUNTER': 0,
+    }
+
+  def packet(self, frame):
+    return libsafety_py.make_CANPacket(frame[0], frame[2], frame[1])
+
+  def gear(self, value):
+    return self.packer.make_can_msg('GEAR', 0, {'PRNDL': value})
+
+  def feed(self, tick, *, active=True, main=True, gas=0.0, brake=0, speed=0.0, fault=0, gear=4, omit_gear=False):
+    self.safety.set_timer(tick * 10_000)
+    self.stock.update(ACC_ACTIVE=int(active), ACC_AVAILABLE=int(main), ACC_FAULTED=fault, COUNTER=tick % 16)
+    if not omit_gear:
+      self.safety.safety_rx_hook(self.packet(self.gear(gear)))
+    for name, values in [
+      ('EPS_2', {}),
+      ('ESP_1', {'Brake_Pedal_State': brake}),
+      ('SPEED_1', {'SPEED_LEFT': speed, 'SPEED_RIGHT': speed}),
+      ('ECM_5', {'Accelerator_Position': gas}),
+      ('DAS_3', self.stock),
+    ]:
+      self.assertTrue(self.safety.safety_rx_hook(self.packet(self.packer.make_can_msg(name, 0, values))))
+    self.safety.safety_tick()
+
+  def ready(self):
+    self.select()
+    for tick in range(20):
+      self.feed(tick)
+    self.assertTrue(self.safety.get_controls_allowed())
+    self.feed(20, active=False)
+    self.assertTrue(self.safety.safety_config_valid())
+    self.assertFalse(self.safety.get_controls_allowed())
+
+  def hold(self, offset=2, decel=-2.0):
+    return create_das_3_command(self.packer, offset, decel, self.stock)
+
+  def test_physical_acc_braking_arms_retention_and_disengaged_resume(self):
+    self.ready()
+    for offset in (2, 3):
+      self.assertTrue(self.safety.safety_tx_hook(self.packet(self.hold(offset))))
+    button = self.packer.make_can_msg('CRUISE_BUTTONS', 0, {'ACC_Resume': 1})
+    self.assertTrue(self.safety.safety_tx_hook(self.packet(button)))
+    for name in ('ACC_Cancel', 'ACC_Resume'):
+      self.assertFalse(self.safety.safety_tx_hook(self.packet(self.packer.make_can_msg('CRUISE_BUTTONS', 0, {name: 1, 'ACC_Distance_Dec': 1}))))
+
+  def test_driver_main_stale_and_unarmed_withdrawal(self):
+    for change in ('gas', 'brake', 'speed', 'main', 'stale', 'unarmed'):
+      self.ready()
+      if change == 'stale':
+        self.safety.set_timer(1_200_001)
+        self.safety.safety_tick()
+      elif change == 'unarmed':
+        self.select()
+        self.feed(20, active=False)
+      else:
+        self.feed(21, active=False, **{change: {'gas': 1.0, 'brake': 1, 'speed': 1.0, 'main': False}[change]})
+      self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())), change)
+      self.assertFalse(self.safety.safety_tx_hook(self.packet(self.packer.make_can_msg('CRUISE_BUTTONS', 0, {'ACC_Resume': 1}))), change)
+
+  def test_decel_counter_checksum_bus_length_and_copied_field_denials(self):
+    self.ready()
+    for decel in (-3.0, -0.5):
+      self.assertTrue(self.safety.safety_tx_hook(self.packet(self.hold(decel=decel))))
+    for decel in (-3.01, -0.49, 0.0, 1.0):
+      self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold(decel=decel))))
+    for offset in (0, 1, 4):
+      self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold(offset))))
+    address, data, bus = self.hold()
+    for invalid_bus, invalid_data in ((1, data), (2, data), (0, data[:7]), (0, data + b'0000')):
+      self.assertFalse(self.safety.safety_tx_hook(self.packet((address, invalid_data, invalid_bus))))
+    for signal in ('ACC_GO', 'ACC_STANDSTILL', 'ENGINE_TORQUE_REQUEST_MAX', 'ACC_BRK_PREP'):
+      fields = self.stock.copy()
+      fields.update(
+        ACC_AVAILABLE=1,
+        ACC_ACTIVE=1,
+        ACC_GO=0,
+        ACC_STANDSTILL=0,
+        ACC_DECEL_REQ=1,
+        ACC_BRK_PREP=0,
+        ENGINE_TORQUE_REQUEST_MAX=0,
+        GR_MAX_REQ=2,
+        COUNTER=(fields['COUNTER'] + 2) % 16,
+      )
+      fields[signal] = 1
+      self.assertFalse(self.safety.safety_tx_hook(self.packet(self.packer.make_can_msg('DAS_3', 0, fields))), signal)
+    changed = bytearray(data)
+    changed[-1] ^= 1
+    self.assertFalse(self.safety.safety_tx_hook(self.packet((address, bytes(changed), bus))))
+
+  def test_permission_word_and_lifecycle_isolation(self):
+    for word in (0, 1, 2, 3, 5, 6, 7, 8, 12):
+      self.select(word)
+      self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())), word)
+    self.ready()
+    self.select()
+    self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+
+  def test_physical_cancel_and_crc_health_revoke_retention(self):
+    self.ready()
+    button = self.packer.make_can_msg('CRUISE_BUTTONS', 0, {'ACC_Cancel': 1, 'ACC_Distance_Dec': 1})
+    self.safety.safety_rx_hook(self.packet(button))
+    self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+    for tick in range(21, 25):
+      self.feed(tick, active=False)
+    self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+    for tick in range(25, 28):
+      self.feed(tick, active=True)
+    self.feed(28, active=False)
+    self.assertTrue(self.safety.safety_tx_hook(self.packet(self.hold())))
+    address, data, bus = self.packer.make_can_msg('DAS_3', 0, self.stock)
+    invalid = bytearray(data)
+    invalid[-1] ^= 1
+    self.assertFalse(self.safety.safety_rx_hook(self.packet((address, bytes(invalid), bus))))
+    self.safety.safety_tick()
+    self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+
+  def test_crc_valid_inactive_acc_fault_releases_hold_until_reengagement(self):
+    for fault in (1, 2, 3):
+      with self.subTest(fault=fault):
+        self.ready()
+        self.assertTrue(self.safety.safety_tx_hook(self.packet(self.hold())))
+        self.feed(21, active=False, fault=fault)
+        self.assertTrue(self.safety.safety_config_valid())
+        self.assertFalse(self.safety.get_controls_allowed())
+        resume = self.packer.make_can_msg('CRUISE_BUTTONS', 0, {'ACC_Resume': 1})
+        self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+        self.assertFalse(self.safety.safety_tx_hook(self.packet(resume)))
+        self.feed(22, active=False, fault=0)
+        self.assertTrue(self.safety.safety_config_valid())
+        self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+        self.assertFalse(self.safety.safety_tx_hook(self.packet(resume)))
+        self.feed(23, active=True, fault=0)
+        self.assertTrue(self.safety.get_controls_allowed())
+        self.feed(24, active=False, fault=0)
+        self.assertFalse(self.safety.get_controls_allowed())
+        self.assertTrue(self.safety.safety_tx_hook(self.packet(self.hold())))
+        self.assertTrue(self.safety.safety_tx_hook(self.packet(resume)))
+
+  def test_native_reverse_pause_and_fresh_drive_reengagement(self):
+    self.ready()
+    self.feed(21, active=False, gear=2)
+    self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+    self.feed(22, active=False, gear=4)
+    self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+    self.feed(23, active=True, gear=4)
+    self.feed(24, active=False, gear=4)
+    self.assertTrue(self.safety.safety_tx_hook(self.packet(self.hold())))
+
+  def test_native_gear_and_das_source_expire_independently(self):
+    self.ready()
+    for tick in range(21, 33):
+      self.feed(tick, active=False, omit_gear=True)
+    self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+    self.ready()
+    self.safety.set_timer(300_001)
+    self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+
+  def test_native_bad_gear_counter_wrong_bus_and_commanded_cancel(self):
+    self.ready()
+    address, data, bus = self.gear(1)
+    self.safety.safety_rx_hook(self.packet((address, data, 1)))
+    self.assertTrue(self.safety.safety_tx_hook(self.packet(self.hold())))
+    invalid = bytearray(data)
+    invalid[3] ^= 0x20
+    self.safety.safety_rx_hook(self.packet((address, bytes(invalid), bus)))
+    self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+    self.ready()
+    cancel = self.packer.make_can_msg('CRUISE_BUTTONS', 0, {'ACC_Cancel': 1})
+    self.assertTrue(self.safety.safety_tx_hook(self.packet(cancel)))
+    self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
+
+  def test_repeated_invalid_gear_does_not_renew_permission(self):
+    self.ready()
+    address, data, bus = self.gear(4)
+    self.safety.safety_rx_hook(self.packet((address, data, bus)))
+    # Same counter is invalid, including when repeated after invalidation.
+    for _ in range(3):
+      self.safety.safety_rx_hook(self.packet((address, data, bus)))
+      self.assertFalse(self.safety.safety_tx_hook(self.packet(self.hold())))
diff --git a/openpilot/common/libcommon.a b/openpilot/common/libcommon.a
index 7aa717926d..ab52133caf 100644
Binary files a/openpilot/common/libcommon.a and b/openpilot/common/libcommon.a differ
diff --git a/openpilot/common/libparams_c.so b/openpilot/common/libparams_c.so
index 165c9b9e22..9196e851d5 100755
Binary files a/openpilot/common/libparams_c.so and b/openpilot/common/libparams_c.so differ
diff --git a/openpilot/common/params_keys.h b/openpilot/common/params_keys.h
index 4d55276dbf..944a76108a 100644
--- a/openpilot/common/params_keys.h
+++ b/openpilot/common/params_keys.h
@@ -22,6 +22,7 @@ inline static std::unordered_map<std::string, ParamKeyAttributes> keys = {
     {"AlwaysOnLateral", {PERSISTENT, BOOL, "1"}},
     {"NostalgiaMode", {PERSISTENT, BOOL, "0"}},
     {"ToyotaAutoHold", {PERSISTENT, BOOL, "0"}},
+    {"JeepBrakeHold", {PERSISTENT, BOOL, "0"}},
     {"ToyotaRadarMode", {PERSISTENT, INT, "0"}},
     {"RemoteStartBootsComma", {PERSISTENT, BOOL, "0"}},
     {"HKGRemoteStartBootsComma", {PERSISTENT, BOOL, "0"}},
diff --git a/openpilot/selfdrive/pandad/tests/test_aol_protocol.cc b/openpilot/selfdrive/pandad/tests/test_aol_protocol.cc
index b4f6900f56..3e8355a669 100644
--- a/openpilot/selfdrive/pandad/tests/test_aol_protocol.cc
+++ b/openpilot/selfdrive/pandad/tests/test_aol_protocol.cc
@@ -91,7 +91,7 @@ int main() {
     auto chrysler = status();
     chrysler.safety_mode = 9U;
     chrysler.safety_param = static_cast<uint16_t>(word);
-    assert(aol_capable(chrysler, 9U, VEHICLE_REGISTRY) == ((word == 0U) || (word == 1U) || (word == 8U)));
+    assert(aol_capable(chrysler, 9U, VEHICLE_REGISTRY) == ((word == 0U) || (word == 1U) || (word == 4U) || (word == 8U)));
     chrysler.capability_flags = 0U;
     assert(!aol_capable(chrysler, 9U, VEHICLE_REGISTRY));
   }
diff --git a/openpilot/starpilot/car/chrysler/aol.py b/openpilot/starpilot/car/chrysler/aol.py
index 1e73a09eb2..8060bcda6c 100644
--- a/openpilot/starpilot/car/chrysler/aol.py
+++ b/openpilot/starpilot/car/chrysler/aol.py
@@ -19,7 +19,7 @@ def policy_for(cp):
 
 
 def native_profile_supported(model, param):
-  return model == int(structs.CarParams.SafetyModel.chrysler) and param in (0, 1, 8)
+  return model == int(structs.CarParams.SafetyModel.chrysler) and param in (0, 1, 4, 8)
 
 
 def native_accepts_cp(cp, model, param):
diff --git a/openpilot/starpilot/car/chrysler/aol_policy.h b/openpilot/starpilot/car/chrysler/aol_policy.h
index e98ebe5d4f..132c48d01f 100644
--- a/openpilot/starpilot/car/chrysler/aol_policy.h
+++ b/openpilot/starpilot/car/chrysler/aol_policy.h
@@ -3,7 +3,7 @@
 #include "selfdrive/pandad/aol_protocol.h"
 
 inline bool chrysler_aol_param(uint16_t param) {
-  return (param == 0U) || (param == 1U) || (param == 8U);
+  return (param == 0U) || (param == 1U) || (param == 4U) || (param == 8U);
 }
 
 inline constexpr AolSafetyProfile CHRYSLER_AOL_PROFILE{9U, chrysler_aol_param, true};
diff --git a/openpilot/starpilot/galaxy/vehicle_configuration.py b/openpilot/starpilot/galaxy/vehicle_configuration.py
index d3a8894dc7..a69815ef79 100644
--- a/openpilot/starpilot/galaxy/vehicle_configuration.py
+++ b/openpilot/starpilot/galaxy/vehicle_configuration.py
@@ -5,7 +5,8 @@ from openpilot.starpilot.vehicle_selection import read_selection
 
 
 STARTUP_KEYS = ('AlphaLongitudinalEnabled', 'IsReleaseBranch', 'OpenpilotEnabledToggle', 'SafeMode',
-                'DisableOpenpilotLongitudinal', 'ToyotaAutoHold', 'ToyotaRadarMode', 'VoltSNG', 'GMAutoHold', 'VoltOnePedalMode', 'TurnAssist', 'LongPitch',
+                'DisableOpenpilotLongitudinal', 'ToyotaAutoHold', 'JeepBrakeHold',
+                'ToyotaRadarMode', 'VoltSNG', 'GMAutoHold', 'VoltOnePedalMode', 'TurnAssist', 'LongPitch',
                 'HondaBoschARadar', 'NAPPedalEnabled', 'NAPRadarEnabled', 'NAPRadarBehindNosecone')
 
 
diff --git a/openpilot/starpilot/ui/feature_settings_owner.py b/openpilot/starpilot/ui/feature_settings_owner.py
index de0c0cc6bc..325927e210 100644
--- a/openpilot/starpilot/ui/feature_settings_owner.py
+++ b/openpilot/starpilot/ui/feature_settings_owner.py
@@ -74,7 +74,7 @@ from openpilot.starpilot.controllers.toyota_cruise import capability as toyota_c
 
 BOOL_DEFAULTS = {
   "GMPedalLongitudinal": False, "ForceStops": False, "AlwaysAllowUploads": False, "TurnAssist": True,
-  "ReverseCruise": False, "ToyotaAutoHold": False, "VoltSNG": False, "GMAutoHold": False, "VoltOnePedalMode": False,
+  "ReverseCruise": False, "ToyotaAutoHold": False, "JeepBrakeHold": False, "VoltSNG": False, "GMAutoHold": False, "VoltOnePedalMode": False,
   "RemapCancelToDistance": False, "LongPitch": True, "DisableOpenpilotLongitudinal": False,
   "SpeedLimitController": False, "ShowSpeedLimits": True,
   "SLCConfirmation": False,
@@ -318,6 +318,28 @@ class FeatureSettingsOwner:
     return commit_exact(self.params, key=request.key, max_bytes=128, raw=b"1" if request.value == "On" else b"0",
                         expected=request.expected, authorized=authorized, temp_prefix=".gm-stop-").verified
 
+  def _jeep_hold_capability(self):
+    from opendbc.car.chrysler.brake_hold import brake_hold_supported
+    cp = self.vehicle_params()
+    try:
+      if not brake_hold_supported(cp):
+        return None
+      return (str(cp.carFingerprint), int(cp.flags),
+              tuple((str(config.safetyModel), int(config.safetyParam)) for config in cp.safetyConfigs),
+              str(cp.carVin) if cp.carVin else None)
+    except (AttributeError, TypeError, ValueError):
+      return None
+
+  def _apply_jeep_hold(self, request):
+    if not request.confirmation or request.value not in ("Off", "On") or request.dependencies:
+      return False
+    def authorized():
+      return (bool(request.vehicle_fingerprint) and self.vehicle_fingerprint() == request.vehicle_fingerprint and
+              request.capability is not None and request.capability == self._jeep_hold_capability() and
+              self.authority("vehicle") and self.authority("parked_preferences") and request.expected in (None, b"0", b"1"))
+    return commit_exact(self.params, key="JeepBrakeHold", max_bytes=128, raw=b"1" if request.value == "On" else b"0",
+                        expected=request.expected, authorized=authorized, temp_prefix=".jeep-hold-").verified
+
   def _auto_hold_capability(self) -> tuple | None:
     from opendbc.car.toyota.interface import toyota_auto_hold_supported
     cp = self.vehicle_params()
@@ -713,7 +735,8 @@ class FeatureSettingsOwner:
               FeatureRow("", "Always On Lateral", "Keep steering assistance active independently of cruise control", page=FeaturePage.AOL, available=True),
               FeatureRow("", "Wheel Controls", "Assign steering-wheel buttons and cruise behavior", page=FeaturePage.WHEEL, available=True)]
       if (self._long_pitch_capability() is not None or self._bolt_disable_capability() is not None or
-          self._auto_hold_capability() is not None or self._toyota_radar_capability() is not None or self._pedal_setup_capability() is not None or
+          self._auto_hold_capability() is not None or self._jeep_hold_capability() is not None or
+          self._toyota_radar_capability() is not None or self._pedal_setup_capability() is not None or
           self._gm_stop_capability("VoltSNG") is not None or
           self._gm_stop_capability("GMAutoHold") is not None or self.tesla_screen.capability() is not None or
           self.gm_tune.capability() is not None or self.gm_truck.capability() is not None or
@@ -740,6 +763,12 @@ class FeatureSettingsOwner:
           reason=("Optional RAV4 2022/2023 receiver. Off retains the original radar choice. Applies after startup; " +
                   "native safety and ECU configuration are unchanged."),
           capability=radar_capability, default_value="Off"))
+      jeep_capability = self._jeep_hold_capability()
+      if jeep_capability is not None:
+        row = self._bool_row("JeepBrakeHold", "Jeep Brake Hold",
+                             configurable and parked and self.authority("vehicle") and self.authority("parked_preferences"),
+                             "Retains a cruise-controlled stop until you press a pedal or cancel cruise. Applies after the next startup")
+        rows.append(replace(row, available=row.available and self._readable("JeepBrakeHold"), capability=jeep_capability))
       rows.extend(self.tesla_screen.rows(parked))
       rows.extend(self.gm_cancel_remap.rows(parked))
 
@@ -1200,6 +1229,8 @@ class FeatureSettingsOwner:
       return self._apply_gm_stop(request)
     if key == "LongPitch":
       return self._apply_long_pitch(request)
+    if key == "JeepBrakeHold":
+      return self._apply_jeep_hold(request)
     if key == "ToyotaAutoHold":
       return self._apply_auto_hold(request)
     if key == "ToyotaRadarMode":
diff --git a/openpilot/starpilot/ui/tests/test_jeep_brake_hold_preference.py b/openpilot/starpilot/ui/tests/test_jeep_brake_hold_preference.py
new file mode 100644
index 0000000000..3d045c6bcd
--- /dev/null
+++ b/openpilot/starpilot/ui/tests/test_jeep_brake_hold_preference.py
@@ -0,0 +1,87 @@
+"""Saved Jeep setting reaches exact startup permission and settings revision."""
+
+from dataclasses import replace
+import tempfile
+import json
+import unittest
+from unittest.mock import patch
+from opendbc.car import gen_empty_fingerprint
+from opendbc.car.chrysler.interface import CarInterface
+from opendbc.car.chrysler.values import CAR
+from openpilot.common.params import Params, params_put, params_get, _copy_string
+from openpilot.starpilot.ui.feature_settings_owner import FeatureSettingsOwner
+from openpilot.starpilot.ui.feature_settings_state import row_change
+from openpilot.starpilot.vehicle_preferences import VehicleStartupPreferences
+from openpilot.starpilot.galaxy import vehicle_configuration as configuration
+from openpilot.starpilot.vehicle_selection import encode
+
+
+def put_stored(params, key, value):
+  assert type(value) is bytes
+  if key == 'VehicleSelection':
+    params.put(key, json.loads(value), block=True)
+  elif value in (b'0', b'1'):
+    params.put_bool(key, value == b'1', block=True)
+  else:
+    assert params_put(params.p, params.check_key(key), value, len(value), True) == 0
+
+
+def get_raw(params, key):
+  return _copy_string(params_get(params.p, params.check_key(key), False))
+
+
+class TestJeepBrakeHoldPreference(unittest.TestCase):
+  def test_real_owner_saved_setting_and_strict_next_startup(self):
+    with tempfile.TemporaryDirectory() as directory:
+      saved = Params(directory)
+      cp = CarInterface.get_params(CAR.JEEP_GRAND_CHEROKEE, gen_empty_fingerprint(), [], False, False, False)
+      groups = {'vehicle': True, 'parked_preferences': True}
+      owner = FeatureSettingsOwner(saved, lambda group: groups.get(group, True), vehicle_fingerprint=lambda: cp.carFingerprint, vehicle_params=lambda: cp)
+      row = next(
+        row for row in owner.snapshot('vehicle', parked=True, system_long=False, lateral_context=True, metric=False).rows if row.key == 'JeepBrakeHold'
+      )
+      request = replace(row_change(row), confirmation=True)
+      for group in groups:
+        groups[group] = False
+        self.assertFalse(owner.apply(request))
+        self.assertIsNone(saved.get('JeepBrakeHold'))
+        groups[group] = True
+      self.assertTrue(owner.apply(request))
+      self.assertEqual(get_raw(saved, 'JeepBrakeHold'), b'1')
+      for raw, safe, enabled, word in (
+        (b'1', b'0', True, 4),
+        (b'0', b'0', True, 0),
+        (b'bad', b'0', True, 0),
+        (b'1', b'1', True, 0),
+        (b'1', b'bad', True, 0),
+        (b'1', b'0', False, 0),
+      ):
+        put_stored(saved, 'JeepBrakeHold', raw)
+        put_stored(saved, 'SafeMode', safe)
+        target = CarInterface.get_params(CAR.JEEP_GRAND_CHEROKEE, gen_empty_fingerprint(), [], False, False, False)
+        VehicleStartupPreferences.read(saved, enabled=enabled).prepare(target)
+        self.assertEqual(target.safetyConfigs[0].safetyParam, word)
+        self.assertEqual(get_raw(saved, 'JeepBrakeHold'), raw)
+      cp.carFingerprint = CAR.DODGE_DURANGO
+      self.assertFalse(owner.apply(request))
+
+  def test_actual_galaxy_startup_interleaving_and_physical_revision(self):
+    with tempfile.TemporaryDirectory() as directory:
+      saved = Params(directory)
+      put_stored(saved, 'VehicleSelection', encode(str(CAR.JEEP_GRAND_CHEROKEE)))
+      saved.put_bool('OpenpilotEnabledToggle', True, block=True)
+      saved.put_bool('JeepBrakeHold', False, block=True)
+      real = configuration._factory_context
+
+      def interleaved(*args):
+        result = real(*args)
+        saved.put_bool('JeepBrakeHold', True, block=True)
+        return result
+
+      with patch.object(configuration, '_factory_context', side_effect=interleaved):
+        self.assertEqual(configuration.configuration_context(saved, None, None), (None, None))
+      cp = CarInterface.get_params(CAR.JEEP_GRAND_CHEROKEE, gen_empty_fingerprint(), [], False, False, False)
+      _, first = configuration.configuration_context(saved, cp, b'physical')
+      saved.put_bool('JeepBrakeHold', False, block=True)
+      _, second = configuration.configuration_context(saved, cp, b'physical')
+      self.assertNotEqual(first, second)
diff --git a/openpilot/starpilot/vehicle_preferences.py b/openpilot/starpilot/vehicle_preferences.py
index 03f946e5b8..620bedd40d 100644
--- a/openpilot/starpilot/vehicle_preferences.py
+++ b/openpilot/starpilot/vehicle_preferences.py
@@ -19,6 +19,7 @@ def bolt_disable_supported(cp) -> bool:
 @dataclass(frozen=True)
 class VehicleStartupPreferences:
   toyota_auto_hold: bool = False
+  jeep_brake_hold: bool = False
   turn_assist: bool = False
   gm_long_pitch: bool = True
   disable_bolt_long: bool = False
@@ -65,6 +66,8 @@ class VehicleStartupPreferences:
       requested = read_saved(params, "ToyotaAutoHold", 8) == (b"1", True)
       safe, readable = read_saved(params, "SafeMode", 8)
       toyota = bool(enabled and requested and readable and safe in (None, b"0"))
+      jeep_hold = bool(enabled and read_saved(params, "JeepBrakeHold", 8) == (b"1", True) and
+                       readable and safe in (None, b"0"))
       volt_sng = bool(enabled and read_saved(params, "VoltSNG", 8) == (b"1", True) and
                       readable and safe in (None, b"0"))
       gm_auto_hold = bool(enabled and not disable_bolt and read_saved(params, "GMAutoHold", 8) == (b"1", True) and
@@ -91,7 +94,7 @@ class VehicleStartupPreferences:
     screen_brake = read_saved(params, 'TeslaAOLDisengageOnBrake', 8) == (b'1', True)
     return cls(toyota_radar_mode=toyota_radar_mode(params, enabled=enabled),
                ford_lateral_mode=ford_mode(params, enabled=enabled), tesla_screen=screen,
-               tesla_screen_brake=screen_brake, toyota_auto_hold=toyota,
+               tesla_screen_brake=screen_brake, toyota_auto_hold=toyota, jeep_brake_hold=jeep_hold,
                gm_longitudinal_tune=selected_tune(params, enabled=enabled),
                toyota_lock_doors=bool(enabled and readable and safe in (None, b"0") and
                                      read_saved(params, "LockDoors", 8) == (b"1", True)),
@@ -159,6 +162,8 @@ class VehicleStartupPreferences:
     from opendbc.car.tesla.screen_button import apply_screen_button
     apply_screen_button(cp, self.tesla_screen, self.tesla_screen_brake)
     self._prepare_honda_radar(cp)
+    from opendbc.car.chrysler.brake_hold import apply_brake_hold
+    apply_brake_hold(cp, self.jeep_brake_hold)
     if not self.toyota_filter:
       from opendbc.car.toyota.prius_longitudinal import prepare_stock as prepare_prius_stock
       prepare_prius_stock(cp)
@@ -186,6 +191,8 @@ class VehicleStartupPreferences:
     from opendbc.car.tesla.screen_button import apply_screen_button
     apply_screen_button(cp, self.tesla_screen, self.tesla_screen_brake)
     self._prepare_honda_radar(cp)
+    from opendbc.car.chrysler.brake_hold import apply_brake_hold
+    apply_brake_hold(cp, self.jeep_brake_hold)
     if not self.toyota_filter:
       from opendbc.car.toyota.prius_longitudinal import prepare_stock as prepare_prius_stock
       prepare_prius_stock(cp)