P0122 – BMW DTC

BMW DTC P0122 – Throttle/Pedal Position Sensor/Switch ‘A’ Circuit Low

DTC P0122 meaning on BMW

The Diagnostic Trouble Code (DTC) P0122 for BMW indicates an issue with the Throttle/Pedal Position Sensor/Switch ‘A’ Circuit registering a low voltage. This sensor is responsible for monitoring the position of the throttle pedal and sending signals to the engine control module (ECM) to adjust the throttle accordingly.

BMW DTC P0122 symptoms

Symptoms of DTC P0122 on a BMW may include:

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

BMW DTC P0122 causes

Common causes of DTC P0122 on a BMW include:

• Faulty throttle position sensor
• Corroded or damaged wiring/connectors in the sensor circuit
• Issues with the throttle body
• ECM software or hardware problems

BMW DTC P0122 seriousness

DTC P0122 should not be ignored as it can lead to drivability issues and potential safety concerns. It is important to address this code promptly to ensure the proper functioning of the throttle system in your BMW.

How to diagnose DTC P0122 on BMW

To diagnose DTC P0122 on a BMW, you can perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes and confirm P0122.
2. Inspect the throttle position sensor and its wiring for any visible damage or corrosion.
3. Check the throttle body for any obstructions or malfunctions.
4. Test the sensor’s voltage output using a multimeter to ensure it is within specifications.

How to fix DTC P0122 on BMW

To fix DTC P0122 on a BMW, you can try the following solutions:

1. Replace the throttle position sensor if it is found to be faulty.
2. Repair or replace any damaged wiring or connectors in the sensor circuit.
3. Clean or replace the throttle body if necessary.
4. Update the ECM software or replace the ECM if needed.

How to erase DTC P0122 on BMW

To erase DTC P0122 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM. After addressing the underlying issue causing the code, clearing the code will reset the system and turn off the Check Engine Light.

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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