What does code U02A9 mean?

Q: What does code U02A9 mean?

Lost Communication With Charge Air Cooler Coolant Pump A. U02A9 is a generic communication fault indicating that a control module on the vehicle's network has lost contact with the charge air cooler coolant pump 'A'. The computer detects this when the pump's module stops broadcasting its expected periodic status messages over the controller area network (CAN) bus, so the engine computer knows the pump is no longer reporting in.

DTC codes / U02xx · Lost communication with a control module / U02A9

U02A9Lost Communication With Charge Air Cooler Coolant Pump A

U02A9 is a generic communication fault indicating that a control module on the vehicle's network has lost contact with the charge air cooler coolant pump 'A'. The computer detects this when the pump's module stops broadcasting its expected periodic status messages over the controller area network (CAN) bus, so the engine computer knows the pump is no longer reporting in.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

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.