What does code U028A mean?

Q: What does code U028A mean?

Lost Communication With Transmission Fluid Pump Module B. U028A is a network communication code indicating that the transmission control module (TCM) or another control module has lost contact with the transmission fluid pump module B over the vehicle's controller area network (CAN) bus. The computer has detected that expected periodic messages from that pump module have stopped arriving, which may disable the pump and trigger a warning light.

DTC codes / U02xx · Lost communication with a control module / U028A

U028ALost Communication With Transmission Fluid Pump Module B

U028A is a network communication code indicating that the transmission control module (TCM) or another control module has lost contact with the transmission fluid pump module B over the vehicle's controller area network (CAN) bus. The computer has detected that expected periodic messages from that pump module have stopped arriving, which may disable the pump and trigger a warning light.

SystemNetwork

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaLost communication with a control module

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