U0089Vehicle Communication Bus G
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U0089 covers Vehicle Communication Bus G as a whole, the seventh of the network letters that SAE leaves for manufacturers to assign. No manufacturer documents U0089 publicly, and neither a service bulletin nor an OBD table names a network for the letter G, so the bus behind it can only be identified from the service information for the specific car. Such umbrella codes rest on CARB's demand that a digital input which stops communicating be recognised and given its own fault code. The code says only that the module has a problem with Bus G as a whole; the neighbouring codes narrow it down: U008A for unreliable traffic, U008B to U0091 for single-wire faults, U0079 for a module that switched itself off the bus. What the driver notices depends on which systems share Bus G.
- What you may notice
- Functions handled by Bus G modules fail or act erratically
- Several modules hold communication codes
- Likely causes
- LikelyDamaged wiring or connector on Bus G
- PossibleSupply or ground fault of a module on Bus G
- RareInternal fault of a module disturbing the bus
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.