U008AVehicle Communication Bus G Performance
- Generic OBD-II code · Network
- How the car detects it
- U008A means Vehicle Communication Bus G still carries traffic, but not cleanly. No manufacturer documents U008A publicly. If Bus G is a CAN, every node counts its own transmit and receive errors; Wikipedia describes that a node turns error passive once a counter exceeds 127 and leaves the bus only after the transmit count passes 255, which is the bus-off case coded as U0079. U008A covers the range below that, with repeated frames, delays and occasional corrupted data. Signal quality is a frequent reason: Texas Instruments recommends unterminated stubs of no more than about 0.3 m on high-speed CAN, because reflections in longer branches, such as from tapped-in accessories, can distort bits at the sampling point. CARB requires communication errors to be detected alongside total loss.
- What you may notice
- Short dropouts of functions on Bus G
- Messages that appear briefly and vanish
- Likely causes
- LikelyLoose or corroded contact in a Bus G connector
- PossibleAftermarket device tapped into Bus G with a long branch
- RareTermination of Bus G missing or out of tolerance
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.