diff --git a/opendbc_repo/opendbc/car/hyundai/carstate.py b/opendbc_repo/opendbc/car/hyundai/carstate.py
index 2b30b8308..bcf174058 100644
--- a/opendbc_repo/opendbc/car/hyundai/carstate.py
+++ b/opendbc_repo/opendbc/car/hyundai/carstate.py
@@ -76,6 +76,7 @@ class CarState(CarStateBase):
     self.main_buttons: deque = deque([Buttons.NONE] * PREV_BUTTON_SAMPLES, maxlen=PREV_BUTTON_SAMPLES)
     self.lda_button = 0
     self.lda_button_raw = 0
+    self.lda_button_raw_initialized = False
     self.lda_button_last_raw_rise_ts_nanos = 0
     self.left_paddle = 0
     self.mode_button = 0
@@ -174,15 +175,20 @@ class CarState(CarStateBase):
 
     return False
 
-  def create_alt_bus_lda_button_events(self, cp_source: CANParser) -> list[structs.CarState.ButtonEvent]:
+  def get_alt_bus_lda_button_raw_state(self, cp_source: CANParser) -> tuple[int, int]:
     if self.CP.carFingerprint in ALT_BUS_LDA_BUTTON_SWL_STAT_CARS:
-      raw_lda_button = int(cp_source.vl["CLU13"]["CF_Clu_SWL_Stat"] == 4)
-      raw_lda_button_ts_nanos = cp_source.ts_nanos["CLU13"]["CF_Clu_SWL_Stat"]
-    else:
-      raw_lda_button = int(cp_source.vl["CLU13"]["CF_Clu_LdwsLkasSW"])
-      raw_lda_button_ts_nanos = cp_source.ts_nanos["CLU13"]["CF_Clu_LdwsLkasSW"]
+      return int(cp_source.vl["CLU13"]["CF_Clu_SWL_Stat"] == 4), cp_source.ts_nanos["CLU13"]["CF_Clu_SWL_Stat"]
+    return int(cp_source.vl["CLU13"]["CF_Clu_LdwsLkasSW"]), cp_source.ts_nanos["CLU13"]["CF_Clu_LdwsLkasSW"]
+
+  def create_alt_bus_lda_button_events(self, cp_source: CANParser) -> list[structs.CarState.ButtonEvent]:
+    raw_lda_button, raw_lda_button_ts_nanos = self.get_alt_bus_lda_button_raw_state(cp_source)
     button_events: list[structs.CarState.ButtonEvent] = []
 
+    if not self.lda_button_raw_initialized:
+      self.lda_button_raw_initialized = True
+      self.lda_button_raw = raw_lda_button
+      return button_events
+
     # Some alt-bus LKAS button layouts pulse several times per physical press burst.
     # Collapse each burst into a single synthetic press/release pair.
     if raw_lda_button and not self.lda_button_raw:
@@ -348,7 +354,7 @@ class CarState(CarStateBase):
     lkas_button_events = []
     self.cruise_buttons.extend(cp.vl_all["CLU11"]["CF_Clu_CruiseSwState"])
     self.main_buttons.extend(cp.vl_all["CLU11"]["CF_Clu_CruiseSwMain"])
-    if self.CP.carFingerprint in ALT_BUS_LDA_BUTTON_CARS and cp_alt is not None and cp_alt.ts_nanos["CLU13"]["CF_Clu_LdwsLkasSW"] > 0:
+    if self.CP.carFingerprint in ALT_BUS_LDA_BUTTON_CARS and cp_alt is not None and self.get_alt_bus_lda_button_raw_state(cp_alt)[1] > 0:
       lkas_button_events = self.create_alt_bus_lda_button_events(cp_alt)
     else:
       lkas_button_events = self.create_lkas_button_events(cp, prev_lda_button)
diff --git a/opendbc_repo/opendbc/car/hyundai/tests/test_hyundai.py b/opendbc_repo/opendbc/car/hyundai/tests/test_hyundai.py
index 017cc85aa..773e94ac2 100644
--- a/opendbc_repo/opendbc/car/hyundai/tests/test_hyundai.py
+++ b/opendbc_repo/opendbc/car/hyundai/tests/test_hyundai.py
@@ -719,6 +719,35 @@ class TestHyundaiFingerprint:
     assert any(be.type == ButtonType.lkas and be.pressed for be in ret.buttonEvents)
     assert any(be.type == ButtonType.lkas and not be.pressed for be in ret.buttonEvents)
 
+  def test_sonata_hybrid_alt_bus_initial_high_does_not_emit_lkas_button_event(self):
+    toggles = get_test_toggles()
+    fingerprint = gen_empty_fingerprint()
+    fingerprint[0][0x391] = 8
+    fingerprint[1][0x50C] = 8
+    CP = CarInterface.get_params(CAR.HYUNDAI_SONATA_HYBRID, fingerprint, [], False, False, False, toggles)
+    FPCP = CarInterface.get_starpilot_params(CAR.HYUNDAI_SONATA_HYBRID, fingerprint, [], CP, toggles)
+
+    car_state = CarState(CP, FPCP)
+    can_parsers = car_state.get_can_parsers(CP)
+    packer = CANPacker(DBC[CP.carFingerprint][Bus.pt])
+
+    def update(lkas_button: int, frame: int):
+      msg = packer.make_can_msg("CLU13", 1, {
+        "CF_Clu_SWL_Stat": lkas_button,
+      })
+      can_parsers[Bus.alt].update([(frame, [msg])])
+      return car_state.update(can_parsers, toggles)[0]
+
+    ret = update(4, 1)
+    assert not any(be.type == ButtonType.lkas for be in ret.buttonEvents)
+
+    ret = update(0, 2)
+    assert not any(be.type == ButtonType.lkas for be in ret.buttonEvents)
+
+    ret = update(4, 3)
+    assert any(be.type == ButtonType.lkas and be.pressed for be in ret.buttonEvents)
+    assert any(be.type == ButtonType.lkas and not be.pressed for be in ret.buttonEvents)
+
   def test_genesis_g90_does_not_use_alt_bus_lkas_parser(self):
     toggles = get_test_toggles()
     CP = CarInterface.get_params(CAR.GENESIS_G90, gen_empty_fingerprint(), [], False, False, False, toggles)