BMW DTC C120E – Left Rear Wheel Speed Sensor Drive Off Recognition
DTC C120E meaning on BMW
DTC C120E on a BMW refers to the ¨Left Rear Wheel Speed Sensor Drive Off Recognition¨ fault. This fault code indicates that the vehicle’s onboard computer system has detected an issue with the left rear wheel speed sensor’s ability to recognize when the wheel is being driven off.
BMW DTC C120E symptoms
Symptoms of DTC C120E on a BMW may include:
- ABS warning light illuminated on the dashboard
- Traction control system malfunction
- Loss of stability control
- Increased stopping distance during braking
BMW DTC C120E causes
Common causes of DTC C120E on a BMW include:
- Failed left rear wheel speed sensor
- Corroded or damaged sensor wiring
- Faulty ABS control module
- Wheel speed sensor ring damage or contamination
BMW DTC C120E seriousness
The seriousness of DTC C120E on a BMW depends on the driving conditions and the driver’s reliance on safety systems like ABS and traction control. Ignoring this fault can compromise the vehicle’s stability and safety features, especially during emergency braking or slippery road conditions.
How to diagnose DTC C120E on BMW
To diagnose DTC C120E on a BMW, follow these steps:
- Use a diagnostic scanner to retrieve the fault codes from the vehicle’s ABS system.
- Inspect the left 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 wheel speed sensor ring for damage or contamination.
How to fix DTC C120E on BMW
To fix DTC C120E on a BMW, consider the following steps:
- Replace the left rear wheel speed sensor if it is faulty.
- Repair or replace any damaged or corroded sensor wiring.
- Clean or replace the wheel speed sensor ring if necessary.
- If the issue persists, have the ABS control module checked by a professional.
How to erase DTC C120E on BMW
To erase DTC C120E on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s ABS system. After performing the necessary repairs and confirming that the issue has been resolved, you can reset the fault codes to turn off the warning lights 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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