C0171 Code: Meaning, Causes, and Symptoms | OBD2 Codes

C0171 – TCS Pilot Valve Circuit Malfunction


C0171 Possible Symptoms


Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)


C0171 Possible Causes


Faulty TCS Pilot Valve Solenoid,TCS Pilot Valve Solenoid harness is open or shorted,TCS Pilot Valve Solenoid circuit poor electrical connection


C0171 Description


The Master Cylinder Isolation Valve, or TCS Prime Valve Solenoid circuits are supplied with battery power when the ignition is in the RUN position. The Electronic Brake Control Module (EBCM) controls the valve functions by grounding the circuit when necessary.