BMW DTC C122C – Right Rear Wheel Speed Sensor Circuit Electrical
DTC C122C meaning on BMW
DTC C122C on a BMW refers to a fault with the Right Rear Wheel Speed Sensor Circuit Electrical. This diagnostic trouble code indicates that there is an electrical issue with the circuit responsible for monitoring the speed of the right rear wheel.
BMW DTC C122C symptoms
Symptoms of DTC C122C on a BMW may include:
- ABS warning light illuminated on the dashboard
- Stability control system malfunction
- Loss of traction control
- Impaired ABS functionality
BMW DTC C122C causes
Common causes of DTC C122C on a BMW include:
- Faulty right rear wheel speed sensor
- Wiring or connector issues in the circuit
- Corrosion or damage to the sensor or wiring
- Electronic control module (ECM) failure
BMW DTC C122C seriousness
The seriousness of DTC C122C on a BMW lies in the potential compromise of the vehicle’s safety systems. Issues with the wheel speed sensor circuit can affect the operation of the ABS, stability control, and traction control systems, leading to reduced vehicle stability and braking performance.
How to diagnose DTC C122C on BMW
To diagnose DTC C122C on a BMW, follow these steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s ECM.
- Inspect the right rear wheel speed sensor and its wiring for any visible damage or corrosion.
- Check the sensor’s resistance and signal output using a multimeter.
- Perform a visual inspection of the connector and ensure it is securely connected.
- Test the ECM for proper functionality and communication with the sensor.
How to fix DTC C122C on BMW
To fix DTC C122C on a BMW, consider the following steps:
- Replace the right rear wheel speed sensor if it is found to be faulty.
- Repair or replace any damaged wiring or connectors in the circuit.
- Clean any corrosion from the sensor or wiring connections.
- If the ECM is determined to be the issue, replace or reprogram it as necessary.
How to erase DTC C122C on BMW
To erase DTC C122C on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM. After addressing and fixing the underlying issue causing the fault code, clearing the code will reset the system and turn off the warning light on the dashboard.
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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