What does code U029C mean?

Q: What does code U029C mean?

Lost Communication With Drive Motor Control Module D. U029C is a generic network communication code indicating that one or more control modules have lost the controller area network (CAN) messages from the drive motor control module D, which is the inverter or motor controller responsible for managing the electric drive motor in a hybrid or electric vehicle. The detecting module, often the hybrid powertrain control module or gateway, sets this code when it fails to receive the expected periodic CAN frames from that specific drive motor controller for a calibrated timeout period.

DTC codes / U02xx · Lost communication with a control module / U029C

U029CLost Communication With Drive Motor Control Module D

U029C is a generic network communication code indicating that one or more control modules have lost the controller area network (CAN) messages from the drive motor control module D, which is the inverter or motor controller responsible for managing the electric drive motor in a hybrid or electric vehicle. The detecting module, often the hybrid powertrain control module or gateway, sets this code when it fails to receive the expected periodic CAN frames from that specific drive motor controller for a calibrated timeout period.

SystemNetwork

Code typeGeneric (all makes)

SeverityHigh

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.