diff --git a/selfdrive/car/interfaces.py b/selfdrive/car/interfaces.py
index b9af5afc83..c71d08bb99 100644
--- a/selfdrive/car/interfaces.py
+++ b/selfdrive/car/interfaces.py
@@ -472,9 +472,10 @@ class CarInterfaceBase(ABC):
 
   def toggle_gac(self, cs_out, CS, gac_button, gac_min, gac_max, gac_default, inc_dec):
     if not self.CP.openpilotLongitudinalControl:
-      CS.gac_tr = 2
       CS.gac_tr_cluster = gac_default
-      put_nonblocking("LongitudinalPersonality", "2")
+      if CS.gac_tr != 2:
+        CS.gac_tr = 2
+        put_nonblocking("LongitudinalPersonality", "2")
       return cs_out, CS
     if gac_button:
       self.gac_button_counter += 1
diff --git a/selfdrive/car/toyota/interface.py b/selfdrive/car/toyota/interface.py
index f8ce1598e7..3a24cdd623 100644
--- a/selfdrive/car/toyota/interface.py
+++ b/selfdrive/car/toyota/interface.py
@@ -324,7 +324,9 @@ class CarInterface(CarInterfaceBase):
         self.CS.madsEnabled = self.get_acc_mads(ret.cruiseState.enabled, self.CS.accEnabled, self.CS.madsEnabled)
       if not self.CP.openpilotLongitudinalControl:
         self.CS.gac_tr_cluster = 3
-        put_nonblocking("LongitudinalPersonality", "2")
+        if CS.gac_tr != 2:
+          CS.gac_tr = 2
+          put_nonblocking("LongitudinalPersonality", "2")
       else:
         gap_dist_button = bool(self.CS.gap_dist_button)
         if gap_dist_button: