What does code P25B4 mean?

Q: What does code P25B4 mean?

Turbocharger/Supercharger Wastegate A Stuck Closed. P25B4 indicates that the powertrain control module has detected a condition where the turbocharger or supercharger wastegate valve is stuck in the closed position, preventing the bypass of exhaust gas around the turbine or intake air around the supercharger. The computer typically compares commanded wastegate position with actual position feedback from a sensor or infers the stuck condition by monitoring boost pressure that rises beyond the expected limit for the given operating conditions.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25B4

P25B4Turbocharger/Supercharger Wastegate A Stuck Closed

P25B4 indicates that the powertrain control module has detected a condition where the turbocharger or supercharger wastegate valve is stuck in the closed position, preventing the bypass of exhaust gas around the turbine or intake air around the supercharger. The computer typically compares commanded wastegate position with actual position feedback from a sensor or infers the stuck condition by monitoring boost pressure that rises beyond the expected limit for the given operating conditions.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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