U0079Control Module Communication Bus G Off
- Generic OBD-II code · Network
- How the car detects it
- No manufacturer documents U0079 publicly, so what Bus G is depends entirely on the vehicle. The code belongs to the bus-off family: the controller of the reporting module has collected enough transmit errors to stop sending in order to protect the other nodes. That sets it apart from U0089, the general Bus G fault, and from lost-communication codes such as U0100, which other modules store once they no longer hear the silent one. CARB requires that missing communication of digital inputs and outputs be detected and stored under its own code, which is why a module records its own disconnection. Read all modules first: if only one holds U0079, its transceiver, supply or connector is suspect; if several do, look at the Bus G wiring and termination.
- What you may notice
- Functions of the reporting module unavailable
- Lost-communication codes in other modules
- Likely causes
- PossibleShort between the Bus G wires or to ground
- PossibleFaulty transceiver in the reporting module
- RareSupply or ground dropouts at the reporting module
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.