What does code U05AA mean?

Q: What does code U05AA mean?

Invalid Data Received From Charge Air Cooler Coolant Pump. U05AA is a generic communication fault indicating the engine control module (ECM) or powertrain control module (PCM) received invalid or corrupted data from the charge air cooler coolant pump over the vehicle's controller area network (CAN) bus. The computer detected a message from the pump module that failed its internal plausibility or checksum validation, so it cannot trust the pump's reported status.

DTC codes / U05xx · Network communication / U05AA

U05AAInvalid Data Received From Charge Air Cooler Coolant Pump

U05AA is a generic communication fault indicating the engine control module (ECM) or powertrain control module (PCM) received invalid or corrupted data from the charge air cooler coolant pump over the vehicle's controller area network (CAN) bus. The computer detected a message from the pump module that failed its internal plausibility or checksum validation, so it cannot trust the pump's reported status.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaNetwork communication

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