What does code P26AC mean?

Q: What does code P26AC mean?

Engine Coolant Bypass Valve B Control Circuit / Open. P26AC indicates that the powertrain control module (PCM) has detected an open circuit or abnormal voltage on the control circuit for the engine coolant bypass valve 'B'. This valve routes coolant around the radiator to help the engine warm up quickly and maintain optimal temperature, and the PCM monitors the circuit for expected electrical continuity and current draw.

DTC codes / P26xx · Computer and output circuits / P26AC

P26ACEngine Coolant Bypass Valve B Control Circuit / Open

P26AC indicates that the powertrain control module (PCM) has detected an open circuit or abnormal voltage on the control circuit for the engine coolant bypass valve 'B'. This valve routes coolant around the radiator to help the engine warm up quickly and maintain optimal temperature, and the PCM monitors the circuit for expected electrical continuity and current draw.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

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