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DTC codes / U04xx · Invalid data received from a module / U04A0

U04A0Invalid Data Received From Engine Coolant Pump Control Module

U04A0 means the vehicle's network has lost valid data from the engine coolant pump control module, which is the smart controller that runs the electric coolant pump on many modern engines. The computer detected missing, corrupted, or implausible messages from that module over the controller area network (CAN) bus, so it cannot confirm the pump is being commanded or is operating correctly.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaInvalid data received from a 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.

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