U008FVehicle Communication Bus G (-) Low
- Generic OBD-II code · Network
- How the car detects it
- U008F is the low-voltage fault on the (-) wire of Vehicle Communication Bus G, which on a CAN means CAN-Low touching ground. No public manufacturer document uses U008F. On a high-speed CAN this is one of the faults that let messages through: onsemi measured working transmission with distorted levels, and the node drew about 72 instead of 65 mA because a terminating resistor now drains to ground. NXP lists CAN-Low to ground among the shorts its TJA1043 reports although traffic continues, and warns that such tolerated faults raise current draw and spoil electromagnetic compatibility. A car can therefore run normally with U008F stored. With the battery disconnected, a (-) wire showing near zero ohms to chassis confirms it.
- What you may notice
- Often no noticeable effect, code found during a scan
- Sporadic dropouts on Bus G
- Likely causes
- Likely(-) wire chafed through to the body or a bracket
- PossibleMoisture in a connector bridging the (-) pin to a ground pin
- RareDamaged transceiver in one module pulling the line down
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.