What does code P26B8 mean?

Q: What does code P26B8 mean?

Engine Coolant Bypass Valve C Control Circuit Low. P26B8 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for engine coolant bypass valve C. This valve directs coolant flow to help the engine warm up quickly and maintain optimal temperature, and a low circuit signal means the PCM cannot properly command the valve, often due to a short to ground or an open circuit.

DTC codes / P26xx · Computer and output circuits / P26B8

P26B8Engine Coolant Bypass Valve C Control Circuit Low

P26B8 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the control circuit for engine coolant bypass valve C. This valve directs coolant flow to help the engine warm up quickly and maintain optimal temperature, and a low circuit signal means the PCM cannot properly command the valve, often due to a short to ground or an open circuit.

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.