What does code P1123 mean?

Q: What does code P1123 mean?

Pedal Position Sensor 1 High Input. P1123 on a BMW means the engine control module (DME) has detected an abnormally high voltage signal from the accelerator pedal position sensor 1 circuit, which it interprets as a stuck or over-range pedal input. The DME compares this signal against sensor 2 and the expected range for the current pedal position, and it sets the code when sensor 1 exceeds the calibrated high threshold.

DTC codes / BMW codes / P1123

P1123 · BMWPedal Position Sensor 1 High Input

P1123 on a BMW means the engine control module (DME) has detected an abnormally high voltage signal from the accelerator pedal position sensor 1 circuit, which it interprets as a stuck or over-range pedal input. The DME compares this signal against sensor 2 and the expected range for the current pedal position, and it sets the code when sensor 1 exceeds the calibrated high threshold.

SystemPowertrain

Code typeBMW specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

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