Worn or contaminated accelerator pedal position sensor tracks inside the pedal assembly; Corroded, loose, or damaged electrical connector at the pedal sensor; Chafed or broken wiring between the pedal sensor and the DME; Internal fault in the electronic accelerator pedal module; DME software issue or internal driver circuit fault (less common); Water intrusion or debris interfering with the pedal mechanism

DTC codes / BMW codes / P1544

P1544 · BMWPedal Position Sensor

Q: What does code P1544 mean?

Pedal Position Sensor. P1544 on BMW vehicles indicates that the engine control module (DME) has detected an implausible or missing signal from the pedal position sensor, which is part of the electronic accelerator pedal assembly. The computer compares the two redundant sensor signals inside the pedal and sets this code when they do not agree or when the voltage falls outside the expected range.

P1544 on BMW vehicles indicates that the engine control module (DME) has detected an implausible or missing signal from the pedal position sensor, which is part of the electronic accelerator pedal assembly. The computer compares the two redundant sensor signals inside the pedal and sets this code when they do not agree or when the voltage falls outside the expected range.

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 mode, often limiting throttle response
Hesitation or stumble when pressing the accelerator pedal
Unresponsive or delayed acceleration from a stop
Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

Worn or contaminated accelerator pedal position sensor tracks inside the pedal assembly
Corroded, loose, or damaged electrical connector at the pedal sensor
Chafed or broken wiring between the pedal sensor and the DME
Internal fault in the electronic accelerator pedal module
DME software issue or internal driver circuit fault (less common)
Water intrusion or debris interfering with the pedal mechanism

How to diagnose and fix it

Read all stored fault codes and freeze-frame data with a BMW-capable scan tool to confirm P1544 is current and not historical
Visually inspect the accelerator pedal connector and wiring for corrosion, pin damage, or chafing
Backprobe the pedal sensor signal wires and compare voltages to the manufacturer's specification while slowly pressing the pedal
Check the sensor reference voltage and ground circuits for drops or opens
If wiring and connectors are good, replace the accelerator pedal assembly with a known-good unit and clear adaptations
Clear the fault memory and perform a throttle adaptation reset using the scan tool
Road test the vehicle through several ignition cycles to verify the code does not return

Pedal Sensor Faults That Fool Technicians

A low battery or voltage spike during cranking can set a false P1544, so always clear the code and retest before condemning the pedal.
The pedal position sensor is a dual-track potentiometer, and a single worn track can cause an intermittent code that only appears during certain pedal angles.
Water ingress through the bulkhead harness grommet often corrodes the pedal connector pins on older BMW models, mimicking a failed sensor.
After replacing the pedal, some BMW models require a throttle adaptation reset with a factory-level scan tool, or the code will reappear immediately.
A sticking or binding accelerator pedal mechanism can produce implausible sensor readings without any electrical fault, so check pedal free movement first.

Can I keep driving with P1544?

The vehicle may enter limp mode with reduced power, which can be dangerous in traffic, so limit driving to a safe location or workshop. Avoid aggressive acceleration and have the fault diagnosed promptly to prevent sudden loss of throttle response.

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.