What does code C05D1 mean?

Q: What does code C05D1 mean?

Brake Master Cylinder Piston Position Sensor Supply Circuit. This code indicates that the powertrain control module (PCM) or antilock brake system (ABS) module has detected an abnormal voltage condition on the supply circuit for the brake master cylinder piston position sensor. The sensor itself is likely fine, but the circuit that provides power or ground to it is not delivering the expected voltage, so the module cannot trust the piston position data used for brake assist and stability control functions.

DTC codes / C05xx · Brakes, steering and suspension / C05D1

C05D1Brake Master Cylinder Piston Position Sensor Supply Circuit

This code indicates that the powertrain control module (PCM) or antilock brake system (ABS) module has detected an abnormal voltage condition on the supply circuit for the brake master cylinder piston position sensor. The sensor itself is likely fine, but the circuit that provides power or ground to it is not delivering the expected voltage, so the module cannot trust the piston position data used for brake assist and stability control functions.

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.