What does code P25F4 mean?

Q: What does code P25F4 mean?

Turbocharger/Supercharger Boost Sensor C Circuit Low. P25F4 indicates that the powertrain control module has detected an abnormally low voltage signal on the circuit for Boost Sensor C, which is one of the turbocharger or supercharger boost pressure sensors. The computer expects a voltage within a calibrated range that rises with boost pressure, and a low reading tells it the sensor circuit is shorted to ground, open, or otherwise not reporting correctly.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P25F4

P25F4Turbocharger/Supercharger Boost Sensor C Circuit Low

P25F4 indicates that the powertrain control module has detected an abnormally low voltage signal on the circuit for Boost Sensor C, which is one of the turbocharger or supercharger boost pressure sensors. The computer expects a voltage within a calibrated range that rises with boost pressure, and a low reading tells it the sensor circuit is shorted to ground, open, or otherwise not reporting correctly.

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.