C0646
Brake Pressure Sensor L Circuit High
C0646 is an OBD-II diagnostic trouble code meaning: Brake Pressure Sensor L Circuit High. Common causes: brake pressure sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.
Symptoms
- ABS/ESP indicator is on
- Reduced braking performance
- Unstable operation of the ESP system
Causes
- Brake pressure sensor malfunction
- Open or short circuit in wiring harness
- Problems with the ABS/ESP control unit
- Corrosion of contacts or connectors
How to Fix
- Check the integrity of the sensor wiring harness
- Measure resistance and voltage at the sensor
- Check connectors and contacts for corrosion
- Replace brake pressure sensor if necessary
- Reset the error and check the system
Related codes
Error C0646 by Vehicle Brand
FAQ
What does the C0646 code mean?
C0646 is an OBD-II diagnostic trouble code that indicates: Brake Pressure Sensor L Circuit High
What causes a C0646 error code?
The most common causes of C0646 include: Brake pressure sensor malfunction; Open or short circuit in wiring harness; Problems with the ABS/ESP control unit; Corrosion of contacts or connectors.
How do I fix a C0646 diagnostic trouble code?
To fix C0646: Check the integrity of the sensor wiring harness. Measure resistance and voltage at the sensor. Check connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0646?
Limited driving only, diagnose soon
How much does it cost to fix C0646?
The estimated repair cost for C0646 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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