What does code U029B mean?

Q: What does code U029B mean?

Lost Communication With Drive Motor Control Module C. U029B is a network communication code indicating that the primary engine control module has lost contact with the drive motor control module C, a key component in hybrid and electric vehicle propulsion systems. The computer detected a loss of the controller area network (CAN) messages that this module normally broadcasts, which can be due to a wiring fault, power supply issue, or internal module failure.

DTC codes / U02xx · Lost communication with a control module / U029B

U029BLost Communication With Drive Motor Control Module C

U029B is a network communication code indicating that the primary engine control module has lost contact with the drive motor control module C, a key component in hybrid and electric vehicle propulsion systems. The computer detected a loss of the controller area network (CAN) messages that this module normally broadcasts, which can be due to a wiring fault, power supply issue, or internal module failure.

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.