diff --git a/firmware/controllers/trigger/trigger_central.cpp b/firmware/controllers/trigger/trigger_central.cpp
index 092ab6e9e3..425b7ca614 100644
--- a/firmware/controllers/trigger/trigger_central.cpp
+++ b/firmware/controllers/trigger/trigger_central.cpp
@@ -357,7 +357,9 @@ void TriggerCentral::handleShaftSignal(trigger_event_e signal, efitick_t timesta
 		// That's easy - trigger cycle matches engine cycle
 		triggerIndexForListeners = triggerState.getCurrentIndex();
 	} else {
-		int crankDivider = operationMode == FOUR_STROKE_CRANK_SENSOR ? 2 : 4;
+		// todo: should this logic reuse getCycleDuration?
+		bool isCrankDriven = operationMode == FOUR_STROKE_CRANK_SENSOR || operationMode == FOUR_STROKE_SYMMETRICAL_CRANK_SENSOR;
+		int crankDivider = isCrankDriven ? 2 : 4;
 
 		int crankInternalIndex = triggerState.getTotalRevolutionCounter() % crankDivider;
 
diff --git a/unit_tests/tests/test_cam_vtt_input.cpp b/unit_tests/tests/test_cam_vtt_input.cpp
index 222810e024..396cb5152c 100644
--- a/unit_tests/tests/test_cam_vtt_input.cpp
+++ b/unit_tests/tests/test_cam_vtt_input.cpp
@@ -110,3 +110,21 @@ TEST(sensors, testCamInput) {
 
 	ASSERT_EQ(0,  unitTestWarningCodeState.recentWarnings.getCount()) << "warningCounter#testCamInput #3";
 }
+
+TEST(sensors, testNB2CamInput) {
+	WITH_ENGINE_TEST_HELPER(MAZDA_MIATA_2003);
+
+	// this crank trigger would be easier to test, crank shape is less important for this test
+	engineConfiguration->useOnlyRisingEdgeForTrigger = true;
+	eth.setTriggerType(TT_ONE PASS_ENGINE_PARAMETER_SUFFIX);
+
+	ASSERT_EQ( 0,  GET_RPM()) << "testNB2CamInput RPM";
+	for (int i = 0; i < 5;i++) {
+		eth.fireRise(50);
+	}
+	ASSERT_EQ(1200,  GET_RPM()) << "testNB2CamInput RPM";
+
+	hwHandleVvtCamSignal(TV_FALL, getTimeNowNt() PASS_ENGINE_PARAMETER_SUFFIX);
+	eth.moveTimeForwardUs(MS2US(20));
+	hwHandleVvtCamSignal(TV_RISE, getTimeNowNt() PASS_ENGINE_PARAMETER_SUFFIX);
+}