C123A – BMW DTC

BMW DTC C123A – Right Rear Wheel Speed Sensor

DTC C123A meaning on BMW

DTC C123A on a BMW refers to an issue with the Right Rear Wheel Speed Sensor. This diagnostic trouble code indicates that there is a malfunction or fault detected in the sensor responsible for monitoring the speed of the right rear wheel.

BMW DTC C123A symptoms

Symptoms of DTC C123A on a BMW may include:

• ABS warning light illuminated on the dashboard
• Traction control system malfunction
• Stability control system not functioning properly
• Loss of traction or stability while driving

BMW DTC C123A causes

Common causes of DTC C123A on a BMW include:

• Failed or faulty Right Rear Wheel Speed Sensor
• Wiring or connector issues related to the sensor
• Corrosion or dirt affecting the sensor’s performance
• Electronic control unit (ECU) communication problems

BMW DTC C123A seriousness

The seriousness of DTC C123A on a BMW lies in the potential safety implications. Issues with the wheel speed sensor can affect the proper functioning of the vehicle’s ABS, traction control, and stability control systems, compromising overall driving safety.

How to diagnose DTC C123A on BMW

To diagnose DTC C123A on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s ECU
2. Inspect the Right Rear Wheel Speed Sensor for any visible damage or contamination
3. Check the wiring and connectors associated with the sensor for any issues
4. Perform a road test to observe the vehicle’s behavior and confirm the symptoms

How to fix DTC C123A on BMW

To fix DTC C123A on a BMW, you can try the following solutions:

1. Replace the Right Rear Wheel Speed Sensor if it is found to be faulty
2. Repair or replace any damaged wiring or connectors related to the sensor
3. Clean the sensor and its mounting area to ensure proper operation
4. Clear the fault codes using a diagnostic scanner after completing the repairs

How to erase DTC C123A on BMW

To erase DTC C123A on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECU memory. Follow these steps:

1. Connect the diagnostic scanner to the vehicle’s OBD-II port
2. Select the option to erase fault codes or clear DTCs
3. Follow the on-screen prompts to complete the process
4. Verify that the DTC C123A code has been successfully erased by rescanning the system

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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