What does code P1638 mean?

Q: What does code P1638 mean?

Throttle Valve Position Control Throttle Stuck Temporarily. P1638 on a BMW means the engine control module (ECM) commanded the throttle valve to a target position but the valve did not reach it within the expected time window, so the ECM flagged the throttle as temporarily stuck. The code is stored when the actual throttle position, reported by the throttle position sensors, deviates from the commanded position during a self-test or normal actuation.

DTC codes / BMW codes / P1638

P1638 · BMWThrottle Valve Position Control Throttle Stuck Temporarily

P1638 on a BMW means the engine control module (ECM) commanded the throttle valve to a target position but the valve did not reach it within the expected time window, so the ECM flagged the throttle as temporarily stuck. The code is stored when the actual throttle position, reported by the throttle position sensors, deviates from the commanded position during a self-test or normal actuation.

SystemPowertrain

Code typeBMW specific

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

Guidance is general and written for BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.