C0634

Brake Pressure Sensor A/B Correlation

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

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

C0630 C0632 C0633 C0635