C1027
Left Rear Wheel Speed Sensor Signal Erratic Performance
C1027 is an OBD-II diagnostic trouble code meaning: Left Rear Wheel Speed Sensor Signal Erratic Performance. Common causes: damaged wheel speed sensor, sensor contamination. Estimated repair cost: $33–111.
Symptoms
- ABS/ESP indicator is on
- Incorrect ABS operation
- Disabling the ESP system
- Problems with cruise control
Causes
- Damaged wheel speed sensor
- Sensor contamination
- Broken or damaged wiring harness
- Poor contact in the sensor connector
- Malfunction of the sensor ring (benchmark)
- Problems with the ABS/ESP control unit
How to Fix
- Visually check the sensor and wiring harness for damage
- Clean the sensor from dirt
- Check the sensor resistance (compare with reference values)
- Check the integrity of the wiring harness and contacts in the connector
- Check the condition of the sensor ring (benchmark)
- If necessary, replace the wheel speed sensor
- Clear the error and check if it returns
Related codes
FAQ
What does the C1027 code mean?
C1027 is an OBD-II diagnostic trouble code that indicates: Left Rear Wheel Speed Sensor Signal Erratic Performance
What causes a C1027 error code?
The most common causes of C1027 include: Damaged wheel speed sensor; Sensor contamination; Broken or damaged wiring harness; Poor contact in the sensor connector.
How do I fix a C1027 diagnostic trouble code?
To fix C1027: Visually check the sensor and wiring harness for damage. Clean the sensor from dirt. Check the sensor resistance (compare with reference values). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1027?
Limited driving only, diagnose soon
How much does it cost to fix C1027?
The estimated repair cost for C1027 is $33–111. Actual cost depends on your vehicle, location, and labor rates.
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