What does code U008C mean?

Q: What does code U008C mean?

Vehicle Communication Bus G (+) Low. U008C is a generic network communication code indicating that the vehicle's main communication bus, often called the CAN (Controller Area Network) bus, has a low voltage condition on its G (+) circuit. The computer or gateway module that monitors this bus detected that the positive side of the differential pair is being pulled low, which can disrupt data transmission between modules. This fault typically points to a wiring issue, a failed module, or a power/ground problem affecting the network.

DTC codes / U00xx · Network wiring and bus faults / U008C

U008CVehicle Communication Bus G (+) Low

U008C is a generic network communication code indicating that the vehicle's main communication bus, often called the CAN (Controller Area Network) bus, has a low voltage condition on its G (+) circuit. The computer or gateway module that monitors this bus detected that the positive side of the differential pair is being pulled low, which can disrupt data transmission between modules. This fault typically points to a wiring issue, a failed module, or a power/ground problem affecting the network.

SystemNetwork

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaNetwork wiring and bus faults

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.