Faulty accelerator pedal position sensor (integrated into the pedal assembly); Worn or corroded electrical connector at the pedal sensor; Damaged wiring harness between the pedal sensor and the DME (open, short, or chafed wire); Poor ground connection for the pedal sensor circuit; Internal fault in the engine control module (DME) affecting sensor signal processing; Contamination or mechanical binding within the pedal assembly

DTC codes / BMW codes / P1546

P1546 · BMWPedal Position Sensor

Q: What does code P1546 mean?

Pedal Position Sensor. P1546 on a BMW indicates that the engine control module (DME) has detected an implausible or missing signal from the accelerator pedal position sensor circuit. The DME compares two redundant sensor signals and sets this code when their voltages do not correlate with each other or with the expected range for the current pedal position.

P1546 on a BMW indicates that the engine control module (DME) has detected an implausible or missing signal from the accelerator pedal position sensor circuit. The DME compares two redundant sensor signals and sets this code when their voltages do not correlate with each other or with the expected range for the current pedal position.

SystemPowertrain

Code typeBMW specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

Illumination of the check engine light or electronic throttle control warning lamp
Reduced engine power or limp-home mode with limited throttle response
Hesitation or stumble when pressing the accelerator pedal
Inconsistent or surging engine speed during steady driving
Often no symptoms besides the warning light, especially if the fault is intermittent
Possible stalling or difficulty maintaining idle speed

Common causes, most likely first

Faulty accelerator pedal position sensor (integrated into the pedal assembly)
Worn or corroded electrical connector at the pedal sensor
Damaged wiring harness between the pedal sensor and the DME (open, short, or chafed wire)
Poor ground connection for the pedal sensor circuit
Internal fault in the engine control module (DME) affecting sensor signal processing
Contamination or mechanical binding within the pedal assembly

How to diagnose and fix it

Read and record all stored fault codes and freeze-frame data using a BMW-capable scan tool
Visually inspect the pedal sensor connector and wiring for corrosion, damage, or loose pins
Check the sensor reference voltage and ground at the connector with a multimeter
Perform a live data check of both pedal position sensor voltages while slowly pressing the pedal to verify smooth, correlated signals
If signal is erratic, test the wiring harness for continuity and shorts between the sensor and DME
Replace the accelerator pedal assembly if the sensor is confirmed faulty
Clear codes and perform a throttle adaptation reset with the scan tool, then road test

Pedal Sensor Codes Often Misdiagnosed

A low battery or voltage drop can cause implausible pedal sensor signals and set P1546 without any faulty component, so always check charging system health first.
The pedal sensor is a dual-track potentiometer; a single worn track can cause the code while the other track still provides a usable signal, leading to intermittent symptoms.
Water ingress into the pedal connector or footwell area is a common cause on older BMW models, often overlooked during visual inspection.
After replacing the pedal assembly, a throttle adaptation reset is required; skipping this step can leave the code stored or cause poor driveability.
P1546 can be triggered by a failing DME relay or poor engine ground, so do not replace the pedal before verifying power and ground integrity.

Can I keep driving with P1546?

The vehicle may enter limp-home mode with reduced power, which can be unsafe in traffic. Avoid driving until the fault is diagnosed, especially if the engine hesitates or stalls.

Tools that help

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