BMW DTC C1239 – Left Rear Wheel Speed Sensor
DTC C1239 meaning on BMW
DTC C1239 on a BMW indicates a fault with the Left Rear Wheel Speed Sensor. This fault code is triggered when the vehicle’s onboard computer detects an issue with the sensor’s signal or performance.
BMW DTC C1239 symptoms
Symptoms of DTC C1239 on a BMW may include:
- ABS warning light illuminated on the dashboard
- Traction control system malfunction
- Unusual braking behavior, such as pulsation or grabbing
- Increased stopping distance
BMW DTC C1239 causes
Common causes of DTC C1239 on a BMW include:
- Failed or faulty Left Rear Wheel Speed Sensor
- Damaged wiring or connectors leading to the sensor
- Corrosion or debris affecting the sensor’s performance
BMW DTC C1239 seriousness
The seriousness of DTC C1239 on a BMW lies in the compromised functionality of the ABS and traction control systems. Driving with this fault unresolved can affect the vehicle’s stability and safety, especially during braking and cornering maneuvers.
How to diagnose DTC C1239 on BMW
To diagnose DTC C1239 on a BMW, follow these steps:
- Use a diagnostic scanner to retrieve the fault code and confirm it is C1239.
- Inspect the Left Rear Wheel Speed Sensor for physical damage or contamination.
- Check the wiring and connectors associated with the sensor for any issues.
- Perform a road test to observe the sensor’s performance under different driving conditions.
How to fix DTC C1239 on BMW
To fix DTC C1239 on a BMW, consider the following:
- Replace the Left Rear Wheel Speed Sensor if it is found to be faulty.
- Repair or replace any damaged wiring or connectors leading to the sensor.
- Clean the sensor and its mounting area to ensure proper operation.
- Clear the fault code and perform a test drive to verify the repair.
How to erase DTC C1239 on BMW
To erase DTC C1239 on a BMW, use a diagnostic scanner to clear the fault code from the vehicle’s memory. After clearing the code, perform a test drive to ensure the fault does not reoccur.
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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