What does code P26B1 mean?

Q: What does code P26B1 mean?

Engine Coolant Bypass Valve A Stuck Closed. P26B1 indicates that the engine control module has detected the engine coolant bypass valve 'A' is stuck in the closed position, preventing coolant from flowing through the bypass circuit as commanded. The computer typically monitors valve position via a sensor or infers flow from temperature changes, and it sets this code when the actual state does not match the commanded state within a calibrated time.

DTC codes / P26xx · Computer and output circuits / P26B1

P26B1Engine Coolant Bypass Valve A Stuck Closed

P26B1 indicates that the engine control module has detected the engine coolant bypass valve 'A' is stuck in the closed position, preventing coolant from flowing through the bypass circuit as commanded. The computer typically monitors valve position via a sensor or infers flow from temperature changes, and it sets this code when the actual state does not match the commanded state within a calibrated time.

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.