BMW DTC C1222 – Left Rear Wheel Speed Sensor Overspeed
DTC C1222 meaning on BMW
DTC C1222 on a BMW indicates an overspeed condition detected by the left rear wheel speed sensor. This means that the sensor is reporting a speed for the left rear wheel that is higher than expected based on the vehicle’s speed and other wheel speeds.
BMW DTC C1222 symptoms
Symptoms of DTC C1222 on a BMW may include:
- ABS warning light illuminated on the dashboard
- Traction control system may be disabled
- Unusual braking behavior, such as pulsation or grabbing
BMW DTC C1222 causes
The overspeed condition detected by the left rear wheel speed sensor that triggers DTC C1222 on a BMW can be caused by various factors, including:
- Defective wheel speed sensor
- Wheel speed sensor wiring or connector issues
- Faulty ABS module
- Wheel bearing or hub issues
BMW DTC C1222 seriousness
DTC C1222 should be taken seriously as it can affect the proper functioning of the vehicle’s ABS and traction control systems. Driving with this fault unresolved may compromise the vehicle’s stability and safety, especially during braking and cornering maneuvers.
How to diagnose DTC C1222 on BMW
To diagnose DTC C1222 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s ABS system
- Inspect the left rear wheel speed sensor and its wiring for any visible damage or corrosion
- Test the wheel speed sensor’s output using a multimeter to check for proper operation
- Inspect the ABS module and related components for any signs of malfunction
How to fix DTC C1222 on BMW
Fixing DTC C1222 on a BMW typically involves the following steps:
- Replace the left rear wheel speed sensor if it is found to be faulty
- Repair or replace any damaged wiring or connectors associated with the wheel speed sensor
- If the issue persists, diagnose and address any problems with the ABS module or related components
How to erase DTC C1222 on BMW
To erase DTC C1222 on a BMW, the fault codes can be cleared using a diagnostic scanner or by disconnecting the vehicle’s battery for a few minutes. However, it is important to note that simply clearing the fault codes will not fix the underlying issue causing DTC C1222. It is recommended to diagnose and address the root cause of the fault 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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