BMW DTC C1218 – Left Front Wheel Speed Sensor Supply Voltage Circuit Low
DTC C1218 meaning on BMW
DTC C1218 on a BMW indicates a fault with the Left Front Wheel Speed Sensor Supply Voltage Circuit. This fault code is triggered when the voltage in the circuit supplying power to the left front wheel speed sensor falls below the specified threshold.
BMW DTC C1218 symptoms
Symptoms of DTC C1218 on a BMW may include:
- ABS warning light illuminated on the dashboard
- Stability control system (DSC) warning light activated
- Loss of ABS functionality
- Impaired traction control
BMW DTC C1218 causes
Common causes of DTC C1218 on a BMW include:
- Faulty left front wheel speed sensor
- Wiring or connector issues in the supply voltage circuit
- Corrosion or poor connections in the circuit
- Defective ABS control module
BMW DTC C1218 seriousness
DTC C1218 should be addressed promptly as it can affect the proper functioning of the ABS system and compromise vehicle safety. Driving with this fault unresolved may lead to reduced braking performance and compromised stability control.
How to diagnose DTC C1218 on BMW
To diagnose DTC C1218 on a BMW, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the ABS system
- Inspect the wiring and connectors in the left front wheel speed sensor circuit for damage or corrosion
- Test the left front wheel speed sensor for proper operation
- Check the supply voltage to the sensor using a multimeter
How to fix DTC C1218 on BMW
To fix DTC C1218 on a BMW, you may need to:
- Replace the faulty left front wheel speed sensor
- Repair or replace any damaged wiring or connectors in the circuit
- Clean or repair any corroded connections
- If necessary, replace the ABS control module
How to erase DTC C1218 on BMW
After addressing the underlying issue causing DTC C1218 on a BMW, you can erase the fault code using a diagnostic scanner. Follow these steps:
- Connect the diagnostic scanner to the vehicle’s OBD-II port
- Access the ABS system and clear the fault codes stored in the memory
- Verify that the fault code has been successfully erased
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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