diff --git a/firmware/controllers/idle_thread.cpp b/firmware/controllers/idle_thread.cpp
index f70d38a328..131e9438e8 100644
--- a/firmware/controllers/idle_thread.cpp
+++ b/firmware/controllers/idle_thread.cpp
@@ -295,7 +295,9 @@ private:
 		if (CONFIGB(clutchDownPin) != GPIO_UNASSIGNED) {
 			engine->clutchDownState = efiReadPin(CONFIGB(clutchDownPin));
 		}
-		engine->acSwitchState = getAcToggle(PASS_ENGINE_PARAMETER_SIGNATURE);
+		if (hasAcToggle(PASS_ENGINE_PARAMETER_SIGNATURE)) {
+			engine->acSwitchState = getAcToggle(PASS_ENGINE_PARAMETER_SIGNATURE);
+		}
 		if (CONFIGB(clutchUpPin) != GPIO_UNASSIGNED) {
 			engine->clutchUpState = efiReadPin(CONFIGB(clutchUpPin));
 		}
diff --git a/firmware/controllers/sensors/allsensors.cpp b/firmware/controllers/sensors/allsensors.cpp
index d61d5408df..f28a81d94d 100644
--- a/firmware/controllers/sensors/allsensors.cpp
+++ b/firmware/controllers/sensors/allsensors.cpp
@@ -18,6 +18,10 @@ void initSensors(Logging *sharedLogger DECLARE_ENGINE_PARAMETER_SUFFIX) {
 	initFlexFuelSensor();
 }
 
+bool hasAcToggle(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
+	return engineConfiguration->acSwitchAdc != EFI_ADC_NONE;
+}
+
 // todo: move this somewhere else? maybe.
 bool getAcToggle(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
 	/**
diff --git a/firmware/controllers/sensors/allsensors.h b/firmware/controllers/sensors/allsensors.h
index cf601082ac..f6029a41f0 100644
--- a/firmware/controllers/sensors/allsensors.h
+++ b/firmware/controllers/sensors/allsensors.h
@@ -27,6 +27,7 @@
 
 void initSensors(Logging *sharedLogger DECLARE_ENGINE_PARAMETER_SUFFIX);
 
+bool hasAcToggle(DECLARE_ENGINE_PARAMETER_SIGNATURE);
 bool getAcToggle(DECLARE_ENGINE_PARAMETER_SIGNATURE);
 
 #endif /*SENSORS_H_*/