What does code P2166 mean?

Q: What does code P2166 mean?

Throttle/Pedal Position Sensor 'D' Maximum Stop Performance. P2166 indicates that the engine control module (ECM) has detected a performance problem with the maximum stop position of throttle or pedal position sensor 'D'. The ECM expects a specific signal when the accelerator pedal is fully released or the throttle plate is at its mechanical stop, but the sensor 'D' voltage or position reading does not match that expectation. This code is typically set when the sensor's signal is out of range or inconsistent with the other throttle/pedal sensors during the stop-learn or key-on self-test.

DTC codes / P21xx · Fuel and air metering / P2166

P2166Throttle/Pedal Position Sensor 'D' Maximum Stop Performance

P2166 indicates that the engine control module (ECM) has detected a performance problem with the maximum stop position of throttle or pedal position sensor 'D'. The ECM expects a specific signal when the accelerator pedal is fully released or the throttle plate is at its mechanical stop, but the sensor 'D' voltage or position reading does not match that expectation. This code is typically set when the sensor's signal is out of range or inconsistent with the other throttle/pedal sensors during the stop-learn or key-on self-test.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

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