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P2123 – BMW DTC

BMW DTC P2123 – Throttle/Pedal Position Sensor/Switch ‘D’ Circuit High

DTC P2123 meaning on BMW

The Diagnostic Trouble Code (DTC) P2123 for BMW refers to the Throttle/Pedal Position Sensor/Switch ‘D’ Circuit High. This code indicates that the Engine Control Module (ECM) has detected a higher than expected voltage signal from the throttle or pedal position sensor ‘D’.

BMW DTC P2123 symptoms

Symptoms of DTC P2123 on a BMW may include:

  • Reduced engine power
  • Engine stalling or hesitation
  • Check Engine Light (CEL) illuminated on the dashboard
  • Difficulty accelerating

BMW DTC P2123 causes

Common causes of DTC P2123 on a BMW include:

  • Faulty throttle or pedal position sensor ‘D’
  • Corroded or damaged wiring/connectors in the sensor circuit
  • Issues with the ECM

BMW DTC P2123 seriousness

DTC P2123 should be addressed promptly as it can lead to drivability issues and potential safety concerns. Ignoring this code may result in further damage to the vehicle and could compromise the overall performance of the engine.

How to diagnose DTC P2123 on BMW

To diagnose DTC P2123 on a BMW, you can follow these steps:

  1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
  2. Inspect the throttle and pedal position sensor ‘D’ for any visible damage or corrosion
  3. Check the wiring and connectors in the sensor circuit for any issues
  4. Perform a voltage test on the sensor to verify its operation

How to fix DTC P2123 on BMW

To fix DTC P2123 on a BMW, you can try the following:

  1. Replace the faulty throttle or pedal position sensor ‘D’
  2. Repair or replace any damaged wiring or connectors in the sensor circuit
  3. If necessary, reprogram or replace the ECM

How to erase DTC P2123 on BMW

To erase DTC P2123 on a BMW, you can use a diagnostic scanner to clear the code from the ECM’s memory. After fixing the underlying issue that caused the code, you can reset the code to turn off the Check Engine Light and ensure proper operation of the vehicle.

Recommended tools & DTC Scanners for BMW

Best Diagnostic App for modern BMWs: BimmerLink

Recommended Bluetooth adapter for Bimmerlink: OBDLink CX

Cable adapter for Bimmerlink: Enet Cable USB Type C

For older BMWs we recommend: Autel AutoLink AL319 (2024 version)

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

← All BMW Diagnostic Trouble Codes

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