C1203 – BMW DTC

BMW DTC C1203 – Wheel Speed Sensor Front/Right Circuit/Open

DTC C1203 meaning on BMW

The DTC C1203 for BMW indicates a fault in the Wheel Speed Sensor Front/Right Circuit due to an open circuit. This means that the electronic control unit (ECU) is unable to receive data from the front right wheel speed sensor, which can affect the vehicle’s stability control system.

BMW DTC C1203 symptoms

Symptoms of the DTC C1203 on a BMW may include:

• ABS warning light illuminated on the dashboard
• Traction control system malfunction
• Loss of stability control
• Increased stopping distance during braking

BMW DTC C1203 causes

The common causes of the DTC C1203 on a BMW include:

• Faulty front right wheel speed sensor
• Broken or damaged wiring in the sensor circuit
• Corrosion or poor connections in the sensor circuit
• ECU malfunction

BMW DTC C1203 seriousness

The DTC C1203 for BMW is considered a serious issue as it can compromise the vehicle’s safety systems, such as ABS and traction control. Driving with this fault can lead to reduced stability and control, especially during braking and cornering maneuvers.

How to diagnose DTC C1203 on BMW

To diagnose the DTC C1203 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes from the ECU
2. Inspect the front right wheel speed sensor for any physical damage or contamination
3. Check the wiring and connectors in the sensor circuit for continuity and proper connections
4. Perform a visual inspection of the ECU for signs of damage or water ingress

How to fix DTC C1203 on BMW

To fix the DTC C1203 on a BMW, you can:

1. Replace the front right wheel speed sensor if faulty
2. Repair or replace any damaged wiring in the sensor circuit
3. Clean and secure the connections in the sensor circuit
4. If the ECU is faulty, it may need to be repaired or replaced by a professional

How to erase DTC C1203 on BMW

To erase the DTC C1203 on a BMW, you can:

1. Use a diagnostic scanner to clear the fault codes from the ECU
2. After fixing the underlying issue, drive the vehicle to allow the ECU to relearn the sensor data
3. Ensure that the ABS and traction control systems are functioning properly after clearing the fault code

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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