BMW DTC C1240 – Right Front Wheel Speed Sensor Phase Length Implausible
DTC C1240 meaning on BMW
DTC C1240 on a BMW indicates that there is an issue with the Right Front Wheel Speed Sensor Phase Length being implausible. This means that the signal from the right front wheel speed sensor is not matching the expected phase length, which can affect the proper functioning of the vehicle’s stability control system.
BMW DTC C1240 symptoms
Symptoms of DTC C1240 on a BMW may include:
- ABS warning light illuminated on the dashboard
- Traction control system malfunction
- Stability control system not functioning properly
- Increased stopping distance during braking
BMW DTC C1240 causes
The possible causes of DTC C1240 on a BMW include:
- Faulty right front wheel speed sensor
- Wiring or connection issues in the right front wheel speed sensor circuit
- Corrosion or dirt affecting the sensor’s performance
- Electronic control unit (ECU) malfunction
BMW DTC C1240 seriousness
DTC C1240 should be taken seriously as it can affect the vehicle’s stability and safety systems. Driving with this fault may compromise the effectiveness of the ABS, traction control, and stability control systems, potentially leading to unsafe driving conditions.
How to diagnose DTC C1240 on BMW
To diagnose DTC C1240 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes from the vehicle’s ECU
- Inspect the right front wheel speed sensor and its wiring for any visible damage or corrosion
- Perform a visual inspection of the sensor’s tone ring for any missing or damaged teeth
- Test the sensor’s output signal using a multimeter to check for proper operation
How to fix DTC C1240 on BMW
To fix DTC C1240 on a BMW, you can try the following solutions:
- Replace the right front wheel speed sensor if it is found to be faulty
- Repair any damaged wiring or connections in the sensor circuit
- Clean the sensor and tone ring to remove any dirt or corrosion that may be affecting its performance
- If the issue persists, consult a professional mechanic for further diagnosis and repair
How to erase DTC C1240 on BMW
To erase DTC C1240 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECU’s memory. After performing the necessary repairs and ensuring 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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