What does code C0647 mean?

Q: What does code C0647 mean?

Brake Pressure Sensor L Circuit Low. C0647 means the antilock braking system (ABS) control module has detected a low voltage signal from the brake pressure sensor on the 'L' circuit, which is typically the left-side or secondary pressure sensor depending on the vehicle's labeling. The sensor is reporting pressure outside the expected range, so the module cannot trust the hydraulic pressure data it needs for ABS and stability control decisions.

DTC codes / C06xx · Brakes, steering and suspension / C0647

C0647Brake Pressure Sensor L Circuit Low

C0647 means the antilock braking system (ABS) control module has detected a low voltage signal from the brake pressure sensor on the 'L' circuit, which is typically the left-side or secondary pressure sensor depending on the vehicle's labeling. The sensor is reporting pressure outside the expected range, so the module cannot trust the hydraulic pressure data it needs for ABS and stability control decisions.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.