diff --git a/firmware/controllers/actuators/electronic_throttle.cpp b/firmware/controllers/actuators/electronic_throttle.cpp
index f63238bdff..bf26326db7 100644
--- a/firmware/controllers/actuators/electronic_throttle.cpp
+++ b/firmware/controllers/actuators/electronic_throttle.cpp
@@ -413,8 +413,7 @@ expected<percent_t> EtbController::getClosedLoopAutotune(percent_t target, perce
 		efitick_t now = getTimeNowNt();
 
 		// Determine period
-		float tu = NT2US((float)(now - m_cycleStartTime)) / 1e6;
-		m_cycleStartTime = now;
+		float tu = m_autotuneCycleStart.getElapsedSecondsAndReset(now);
 
 		// Determine amplitude
 		float a = m_maxCycleTps - m_minCycleTps;
diff --git a/firmware/controllers/actuators/electronic_throttle_impl.h b/firmware/controllers/actuators/electronic_throttle_impl.h
index dee1191458..543d907704 100644
--- a/firmware/controllers/actuators/electronic_throttle_impl.h
+++ b/firmware/controllers/actuators/electronic_throttle_impl.h
@@ -117,7 +117,7 @@ private:
 
 	// Autotune helpers
 	bool m_lastIsPositive = false;
-	efitick_t m_cycleStartTime = 0;
+	Timer m_autotuneCycleStart;
 	float m_minCycleTps = 0;
 	float m_maxCycleTps = 0;
 	// Autotune measured parameters: gain and ultimate period