What does code P26B9 mean?

Q: What does code P26B9 mean?

Engine Coolant Bypass Valve C Control Circuit High. P26B9 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the engine coolant bypass valve 'C'. This valve directs coolant flow to regulate temperature, and a high voltage reading typically points to an open circuit, a short to power, or a faulty valve actuator.

DTC codes / P26xx · Computer and output circuits / P26B9

P26B9Engine Coolant Bypass Valve C Control Circuit High

P26B9 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the engine coolant bypass valve 'C'. This valve directs coolant flow to regulate temperature, and a high voltage reading typically points to an open circuit, a short to power, or a faulty valve actuator.

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.