U008EVehicle Communication Bus G (-) Open
- Generic OBD-II code · Network
- How the car detects it
- With U008E the (-) wire of Vehicle Communication Bus G is open, CAN-Low where Bus G is a CAN. U008E is not documented publicly by any maker. Seen with an oscilloscope, CAN-Low beyond the break no longer drops from about 2.5 V to the 1.5 V that Texas Instruments gives for a dominant bit, so receivers there get only the CAN-High half of the signal and less margin against noise. Termination suffers as well: TI recommends that the 120-ohm resistors sit at the line ends and not in a node, because a disconnected node takes its terminator with it, and a broken CAN-Low can cut one of them off in the same way. Transceivers do not flag the open line themselves, as NXP points out. Checking resistance between the wires from both sides of the vehicle helps locate the gap.
- What you may notice
- Modules beyond the break respond only sometimes
- Code comes and goes with temperature or road shocks
- Likely causes
- Likely(-) wire of Bus G broken at a flex point
- PossibleBus G connector not fully latched or a terminal backed out
- RareCorroded splice interrupting 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.