C0504

Symptoms

• Incorrect ABS operation
• Check engine light comes on
• Loss of ESP or TCS function
• Unstable speedometer readings

Causes

• Damage to the wheel speed sensor
• Contamination of the sensor or its magnetic ring
• Damage to the sensor wiring harness
• Poor contact in the sensor connector
• ECU malfunction

How to Fix

1. Check the status of the wheel speed sensor
2. Clean the sensor and magnetic ring
3. Check wiring harness and connectors for damage
4. Replace the wheel speed sensor if necessary
5. Check the operation of the ABS/ESP systems after repair

Related codes

Error C0504 by Vehicle Brand