BMW DTC C120C – Left Front Wheel Speed Sensor Drive Off Recognition
DTC C120C meaning on BMW
DTC C120C on a BMW refers to the ¨Left Front Wheel Speed Sensor Drive Off Recognition¨ fault code. This diagnostic trouble code indicates an issue with the recognition of the left front wheel speed sensor drive off signal.
BMW DTC C120C symptoms
Symptoms of DTC C120C on a BMW may include:
- ABS warning light illuminated on the dashboard
- Traction control system malfunction
- Loss of stability control
- Decreased braking performance
BMW DTC C120C causes
Common causes of DTC C120C on a BMW include:
- Faulty left front wheel speed sensor
- Wiring or connection issues in the sensor circuit
- Corrosion or dirt affecting the sensor’s performance
- Electronic control unit (ECU) failure
BMW DTC C120C seriousness
The seriousness of DTC C120C on a BMW depends on the driving conditions and the extent of the issue. Ignoring this fault code can lead to compromised safety systems such as ABS and traction control, potentially affecting vehicle stability and braking performance.
How to diagnose DTC C120C on BMW
To diagnose DTC C120C on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s ECU.
- Inspect the left front wheel speed sensor and its wiring for any visible damage or corrosion.
- Perform a visual inspection of the sensor’s mounting and tone ring for debris or obstructions.
- Test the sensor’s output signal using a multimeter to check for proper functionality.
How to fix DTC C120C on BMW
To fix DTC C120C on a BMW, you can try the following solutions:
- Replace the faulty left front wheel speed sensor with a new one.
- Repair any damaged wiring or connections in the sensor circuit.
- Clean the sensor and tone ring to ensure proper operation.
- If necessary, reprogram or replace the ECU to address any control unit issues.
How to erase DTC C120C on BMW
To erase DTC C120C on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECU. After performing the necessary repairs and ensuring the issue is resolved, you can reset the fault code to turn off the warning light and restore normal operation of the ABS and traction control systems.
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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