What does code U05A6 mean?

Q: What does code U05A6 mean?

Invalid Data Received From Reductant Heater Control Module. U05A6 is a communication fault where the engine control module (ECM) or another supervisory module receives invalid or corrupted data from the reductant heater control module over the vehicle's controller area network (CAN) bus. The computer has detected that the messages coming from the heater control module do not match expected values or are missing critical information, so it cannot trust the module's status reports.

DTC codes / U05xx · Network communication / U05A6

U05A6Invalid Data Received From Reductant Heater Control Module

U05A6 is a communication fault where the engine control module (ECM) or another supervisory module receives invalid or corrupted data from the reductant heater control module over the vehicle's controller area network (CAN) bus. The computer has detected that the messages coming from the heater control module do not match expected values or are missing critical information, so it cannot trust the module's status reports.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.