C0634
Brake Pressure Sensor A/B Correlation
C0634 is an OBD-II diagnostic trouble code meaning: Brake Pressure Sensor A/B Correlation. Common causes: brake pressure sensor malfunction, problems in the wiring harness or sensor connectors. Estimated repair cost: $56–167.
Symptoms
- ABS/ESP/SRS indicator is on
- Reduced braking performance
- Activating the emergency brake system
- Malfunctions in the stability control system
Causes
- Brake pressure sensor malfunction
- Problems in the wiring harness or sensor connectors
- Low brake fluid level
- Air in the brake system
- EBCM control module software error
How to Fix
- Checking the level and condition of the brake fluid
- Diagnostics of power circuits and signal lines of sensors
- Checking the resistance and signals of pressure sensors
- Soft reset and calibration of the EBCM
- Replacing a faulty pressure sensor or wiring harness
- Bleeding the brake system if necessary
Related codes
Error C0634 by Vehicle Brand
FAQ
What does the C0634 code mean?
C0634 is an OBD-II diagnostic trouble code that indicates: Brake Pressure Sensor A/B Correlation
What causes a C0634 error code?
The most common causes of C0634 include: Brake pressure sensor malfunction; Problems in the wiring harness or sensor connectors; Low brake fluid level; Air in the brake system.
How do I fix a C0634 diagnostic trouble code?
To fix C0634: Checking the level and condition of the brake fluid. Diagnostics of power circuits and signal lines of sensors. Checking the resistance and signals of pressure sensors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0634?
Limited driving only, diagnose soon
How much does it cost to fix C0634?
The estimated repair cost for C0634 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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