BMW DTC P0123 – Throttle/Pedal Position Sensor/Switch ‘A’ Circuit High
DTC P0123 meaning on BMW
DTC P0123 on a BMW indicates an issue with the Throttle/Pedal Position Sensor/Switch ‘A’ Circuit registering a high voltage signal. This means that the sensor is reporting a higher voltage than expected to the engine control module (ECM).
BMW DTC P0123 symptoms
Symptoms of DTC P0123 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine power or acceleration
- Unresponsive throttle pedal
- Inconsistent engine performance
BMW DTC P0123 causes
The common causes of DTC P0123 on a BMW are:
- Faulty Throttle/Pedal Position Sensor/Switch ‘A’
- Wiring or connector issues in the sensor circuit
- ECM malfunction
BMW DTC P0123 seriousness
DTC P0123 should not be ignored as it can lead to drivability issues and potential safety concerns. It is recommended to address this fault promptly to ensure the proper functioning of the throttle system.
How to diagnose DTC P0123 on BMW
To diagnose DTC P0123 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the Throttle/Pedal Position Sensor/Switch ‘A’ for any visible damage or wear
- Check the wiring and connectors for any signs of corrosion or disconnection
- Perform a voltage test on the sensor to verify its output
How to fix DTC P0123 on BMW
To fix DTC P0123 on a BMW, you can try the following solutions:
- Replace the Throttle/Pedal Position Sensor/Switch ‘A’ if it is found to be faulty
- Repair any damaged wiring or connectors in the sensor circuit
- If the ECM is suspected to be the issue, have it tested or replaced by a professional
How to erase DTC P0123 on BMW
To erase DTC P0123 on a BMW, you can clear the fault code using a diagnostic scanner. After addressing the underlying issue causing the fault code, clearing it from the ECM memory will reset the Check Engine Light and ensure the system is functioning properly.
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
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