BMW DTC C123B – Left Front Wheel Speed Sensor – Signal Too High
DTC C123B meaning on BMW
DTC C123B on a BMW indicates that the Left Front Wheel Speed Sensor is reporting a signal that is too high. This means that the sensor is detecting a wheel speed that is higher than expected, which can lead to issues with the vehicle’s stability control system.
BMW DTC C123B symptoms
Symptoms of DTC C123B on a BMW may include:
- ABS warning light illuminated on the dashboard
- Traction control system malfunction
- Stability control system intervention
- Loss of traction or stability while driving
BMW DTC C123B causes
The most common causes of DTC C123B on a BMW include:
- Faulty Left Front Wheel Speed Sensor
- Dirty or damaged wheel speed sensor
- Wiring or connection issues
- Faulty ABS module
BMW DTC C123B seriousness
DTC C123B should be taken seriously as it can affect the vehicle’s stability and safety systems. Driving with a faulty wheel speed sensor can compromise the effectiveness of the ABS, traction control, and stability control systems, increasing the risk of accidents.
How to diagnose DTC C123B on BMW
To diagnose DTC C123B on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the Left Front Wheel Speed Sensor for any visible damage or contamination
- Check the wiring and connections leading to the sensor
- Perform a wheel speed sensor test using a multimeter
How to fix DTC C123B on BMW
To fix DTC C123B on a BMW, you can try the following solutions:
- Replace the Left Front Wheel Speed Sensor if it is faulty
- Clean the wheel speed sensor and its mounting surface
- Repair any damaged wiring or connections
- If necessary, replace the ABS module
How to erase DTC C123B on BMW
To erase DTC C123B on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s system. Once the issue has been resolved and the fault codes erased, the warning lights should turn off. It is important to ensure that the underlying problem causing the fault code has been fixed before clearing the codes.
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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