U008BVehicle Communication Bus G (+) Open
- Generic OBD-II code · Network
- How the car detects it
- On Vehicle Communication Bus G, U008B flags an open (+) conductor, which on a CAN means CAN-High. No manufacturer documents U008B publicly. A useful clue comes from the termination: Texas Instruments describes a high-speed CAN line ending in a 120-ohm resistor at each end, which a meter across CAN-High and CAN-Low sees as about 60 ohms. With CAN-High broken, only the resistor on the measuring side remains in the loop and the reading rises to roughly 120 ohms; on the other side of the break it is the same, which helps locate the gap. Meanwhile the far nodes miss part of the signal and fall silent or drop frames, and as NXP notes, transceivers do not report open lines themselves. Check the (+) wire through every connector of Bus G.
- What you may notice
- Some modules on Bus G not reachable with a scan tool
- Intermittent faults that change with temperature or movement
- Likely causes
- Likely(+) wire of Bus G broken at a hinge, seat or door passage
- PossibleTerminal of the (+) wire pushed out of its connector cavity
- RareCorroded splice in the (+) wire
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.