U0055Vehicle Communication Bus D
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- U0055 covers Vehicle Communication Bus D as a whole, the fourth network slot a manufacturer can assign freely. Volvo documents it for the 2016-17 XC90 T8 plug-in hybrid: the engine control module stores U005500 with fault type intermittent, the driver information display shows the turtle symbol and the car lacks power. Volvo classifies it as a software fault, tells technicians not to replace parts, and announced new software for week 16 of 2017, until then the code was simply cleared. Bentley assigns Bus D to a private chassis CAN and documents its performance code U0056. Without such a bulletin, look first for lost-communication codes that show which module on Bus D is missing, then check its supply, ground and connectors.
- What you may notice
- Turtle symbol and reduced engine power (Volvo XC90 T8)
- Functions of modules on Bus D unavailable
- Lost-communication codes stored alongside
- Likely causes
- LikelyControl module software misjudging Bus D (Volvo XC90 T8: ECM update)
- PossibleSupply or ground fault at a module on Bus D
- PossibleDamaged wiring or loose connector on Bus D
- 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.