What does code U0456 mean?

DTC codes / U04xx · Invalid data received from a module / U0456

U0456Invalid Data Received From Coolant Temperature Control Module

U0456 is a generic communication fault indicating that a control module on the vehicle's network received invalid or corrupted data from the coolant temperature control module. The receiving module expected a valid message containing coolant temperature status or control commands, but the data failed its internal integrity or plausibility checks, so the module flagged the message as invalid and stored this code.

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.