What does code P26AF mean?

Q: What does code P26AF mean?

Engine Coolant Bypass Valve B Stuck/Open. P26AF indicates that the powertrain control module has detected a fault with the engine coolant bypass valve circuit for bank B, specifically that the valve is stuck or stuck open. The computer monitors the valve's electrical circuit and/or its effect on coolant temperature and flow, and it sets this code when the valve fails to respond as commanded or remains in the open position when it should be closed.

DTC codes / P26xx · Computer and output circuits / P26AF

P26AFEngine Coolant Bypass Valve B Stuck/Open

P26AF indicates that the powertrain control module has detected a fault with the engine coolant bypass valve circuit for bank B, specifically that the valve is stuck or stuck open. The computer monitors the valve's electrical circuit and/or its effect on coolant temperature and flow, and it sets this code when the valve fails to respond as commanded or remains in the open position when it should be closed.

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.