Fault code C1170 – a step-by-step guide to diagnosing and fixing it

Error code C1170 is displayed and the check engine light is on - what does this mean?

The DTC C1170 is recognized by the OBD/EOBD system and indicates a problem in the ABS system (anti-lock braking system), specifically with the right rear wheel speed sensor. This fault code relates to the communication between the ABS control unit and the sensor, which affects the proper functioning of the anti-lock braking system.

What can cause this fault code?

• Defective right rear wheel speed sensor
• Damaged or interrupted sensor cable
• Corroded or loose plug connections on the sensor
• Dirty or damaged sensor ring on the wheel
• Defective ABS control unit
• Mechanical damage to the sensor bracket
• Excessive air gap between sensor and sensor ring
• Defective ground or power supply to the sensor

What symptoms occur in parallel with fault code C1170?

• ABS warning light: The ABS indicator light in the dashboard lights up continuously
• ESP malfunction: The electronic stability program can be deactivated
• Braking behavior: ABS function on the right rear wheel does not work properly
• Diagnostic display: Trouble code C1170 is stored in the fault memory
• Warning tones: Audible warning signals may occur in some vehicles
• Reduced driving stability: Especially during emergency braking or on slippery roads

How can the problem with fault code C1170 be rectified?

• Repairing fault code C1170 requires a systematic diagnosis and appropriate measures.
• Carry out sensor cleaning: Remove the right rear wheel speed sensor, clean it thoroughly and check for damage, then refit it with the correct air gap
• Cable inspection and repair: Inspect the entire sensor cable for breaks, chafing or corrosion and repair damaged sections or replace the entire cable
• Replace plug connections: Clean all plug connections on the sensor and control unit, use contact spray and replace the plugs completely if there is corrosion
• Check the sensor ring: Check the sensor ring on the right rear wheel for damage, dirt or loose fit and replace if necessary
• Replace the entire sensor: If the wheel speed sensor is defective, install a new OEM sensor and then calibrate the system
• Diagnose the ABS control unit: If all other components are OK, test the ABS control unit and have it replaced or repaired if defective