What does code P1543 mean?

Q: What does code P1543 mean?

Throttle Actuation Potentiometer Signal Too Low. P1543 on Volkswagen vehicles means the engine control module (ECM) has detected a signal voltage from the throttle actuation potentiometer that is lower than the expected range for the current throttle position. The potentiometer is a second, redundant sensor inside the electronic throttle body that reports the actual blade angle, and a low signal indicates a wiring short to ground, a faulty sensor track, or a poor connection rather than a mechanical throttle fault.

DTC codes / Volkswagen codes / P1543

P1543 · VolkswagenThrottle Actuation Potentiometer Signal Too Low

P1543 on Volkswagen vehicles means the engine control module (ECM) has detected a signal voltage from the throttle actuation potentiometer that is lower than the expected range for the current throttle position. The potentiometer is a second, redundant sensor inside the electronic throttle body that reports the actual blade angle, and a low signal indicates a wiring short to ground, a faulty sensor track, or a poor connection rather than a mechanical throttle fault.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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