Code C0637 indicates the Electronic Brake Control Module has detected a voltage signal from the brake pressure sensor that is below the normal operating range. This fault typically disables electronic stability and traction control systems while leaving standard hydraulic braking functional. The issue is usually located in the sensor wiring, connector, or the sensor itself rather than the control module.
Wires leading to the brake pressure sensor are often chafed, broken, or shorted to ground, causing a low voltage condition.
Moisture or corrosion at the electrical connection can increase resistance and drop the signal voltage below threshold.
The internal circuitry of the sensor may fail, sending a permanently low signal to the control module.
A corroded or loose ground wire for the brake control module can cause erroneous low voltage readings across sensors.
Internal processing failure within the module is possible but statistically rare compared to wiring and sensor faults.
Yes, standard hydraulic braking remains operational, but stability and traction control features will be inactive.
No, module failure is uncommon; most cases are resolved by repairing wiring or replacing the pressure sensor.
No, this code disables anti-lock functions but does not cause the brakes to apply or lock unexpectedly.
The stability system relies on accurate brake pressure data; without it, the system disables itself to prevent unsafe operation.