diff --git a/selfdrive/ui/sunnypilot/ui_state.py b/selfdrive/ui/sunnypilot/ui_state.py
index 21ed78b096..cf123c3e2c 100644
--- a/selfdrive/ui/sunnypilot/ui_state.py
+++ b/selfdrive/ui/sunnypilot/ui_state.py
@@ -7,6 +7,7 @@ See the LICENSE.md file in the root directory for more details.
 from cereal import messaging, log, custom
 from openpilot.common.params import Params
 from openpilot.sunnypilot.sunnylink.sunnylink_state import SunnylinkState
+from openpilot.system.ui.lib.application import gui_app
 
 OpenpilotState = log.SelfdriveState.OpenpilotState
 MADSState = custom.ModularAssistiveDrivingSystem.ModularAssistiveDrivingSystemState
@@ -22,12 +23,30 @@ class UIStateSP:
 
     self.sunnylink_state = SunnylinkState()
 
+    # Onroad Screen Brightness
+    self.onroad_brightness_timer: int = 0
+
   def update(self) -> None:
     if self.sunnylink_enabled:
       self.sunnylink_state.start()
     else:
       self.sunnylink_state.stop()
 
+  def update_onroad_brightness(self, sm, started: bool) -> None:
+    if started and self.onroad_brightness_toggle:
+      ss = sm["selfdriveState"]
+      if ss.alertSize != log.SelfdriveState.AlertSize.none and \
+         ss.alertStatus != log.SelfdriveState.AlertStatus.normal:
+        self.reset_onroad_sleep_timer()
+      elif self.onroad_brightness_timer > 0:
+        self.onroad_brightness_timer -= 1
+
+  def reset_onroad_sleep_timer(self) -> None:
+    if self.onroad_brightness_toggle >= 0 and self.onroad_brightness_toggle:
+      self.onroad_brightness_timer = self.onroad_brightness_timer_param * gui_app.target_fps
+    else:
+      self.onroad_brightness_timer = -1
+
   @staticmethod
   def update_status(ss, ss_sp, onroad_evt) -> str:
     state = ss.state
@@ -75,6 +94,11 @@ class UIStateSP:
     self.chevron_metrics = self.params.get("ChevronInfo")
     self.active_bundle = self.params.get("ModelManager_ActiveBundle")
 
+    # Onroad Screen Brightness
+    self.onroad_brightness_toggle = self.params.get_bool("OnroadScreenOffControl")
+    self.onroad_brightness = self.params.get("OnroadScreenOffBrightness", return_default=True)
+    self.onroad_brightness_timer_param = self.params.get("OnroadScreenOffTimer", return_default=True)
+
 
 class DeviceSP:
   def __init__(self):
diff --git a/selfdrive/ui/ui_state.py b/selfdrive/ui/ui_state.py
index a86c84ada3..1c3a43c820 100644
--- a/selfdrive/ui/ui_state.py
+++ b/selfdrive/ui/ui_state.py
@@ -117,6 +117,7 @@ class UIState(UIStateSP):
       self.update_params()
     device.update()
     UIStateSP.update(self)
+    UIStateSP.update_onroad_brightness(self, self.sm, self.started)
 
   def _update_state(self) -> None:
     # Handle panda states updates
@@ -261,6 +262,10 @@ class Device(DeviceSP):
     if not self._awake:
       brightness = 0
 
+    if gui_app.sunnypilot_ui():
+      if self._awake and ui_state.started and ui_state.onroad_brightness_toggle and ui_state.onroad_brightness_timer == 0:
+        brightness = ui_state.onroad_brightness * 0.01 * brightness
+
     if brightness != self._last_brightness:
       if self._brightness_thread is None or not self._brightness_thread.is_alive():
         self._brightness_thread = threading.Thread(target=HARDWARE.set_screen_brightness, args=(brightness,))