What does code U02AB mean?

DTC codes / U02xx · Lost communication with a control module / U02AB

U02ABLost Communication With Vehicle Thermal Management Control Module

U02AB is a generic communication fault indicating that the vehicle's main control modules have lost contact with the Vehicle Thermal Management Control Module over the Controller Area Network (CAN) data bus. The computer has detected that expected periodic messages from the thermal management module have stopped arriving, which may be due to a wiring fault, a module power issue, or an internal failure of the module itself.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.