C0027
Left Front Wheel Speed Sensor Signal Erratic
C0027 is an OBD-II diagnostic trouble code meaning: Left Front Wheel Speed Sensor Signal Erratic. Common causes: wheel speed sensor malfunction, wiring harness damage. Estimated repair cost: $56–167.
Symptoms
- ABS/ESP indicator is on
- Uneven operation of ABS
- Incorrect speedometer readings (in some models)
- Loss of ESP functions
Causes
- Wheel speed sensor malfunction
- Wiring harness damage
- Contamination or damage to the gear ring (rotor)
- Lost contact in the connector
- Problems with the ABS/ESP module
How to Fix
- Visually inspect the sensor and wiring harness for damage
- Checking the sensor resistance (compare with factory specifications)
- Cleaning the sensor and gear ring from dirt
- Checking continuity with an oscilloscope or scanner
- If necessary, replace the sensor or repair the wiring harness
Related codes
Error C0027 by Vehicle Brand
FAQ
What does the C0027 code mean?
C0027 is an OBD-II diagnostic trouble code that indicates: Left Front Wheel Speed Sensor Signal Erratic
What causes a C0027 error code?
The most common causes of C0027 include: Wheel speed sensor malfunction; Wiring harness damage; Contamination or damage to the gear ring (rotor); Lost contact in the connector.
How do I fix a C0027 diagnostic trouble code?
To fix C0027: Visually inspect the sensor and wiring harness for damage. Checking the sensor resistance (compare with factory specifications). Cleaning the sensor and gear ring from dirt. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0027?
Limited driving only, diagnose soon
How much does it cost to fix C0027?
The estimated repair cost for C0027 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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