What does code P28EE mean?

Q: What does code P28EE mean?

Electric/Auxiliary Transmission Fluid Pump B Underspeed. P28EE indicates that the powertrain control module has detected an underspeed condition in the electric or auxiliary transmission fluid pump circuit designated as B. The computer compares the pump's actual speed, typically via a dedicated speed sensor or motor current feedback, against the commanded speed and sets this code when the pump runs slower than expected for a calibrated period.

DTC codes / P28xx · Transmission / P28EE

P28EEElectric/Auxiliary Transmission Fluid Pump B Underspeed

P28EE indicates that the powertrain control module has detected an underspeed condition in the electric or auxiliary transmission fluid pump circuit designated as B. The computer compares the pump's actual speed, typically via a dedicated speed sensor or motor current feedback, against the commanded speed and sets this code when the pump runs slower than expected for a calibrated period.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaTransmission

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