U0008
UNetworkHigh Speed CAN Bus (-) Voltage High
What does this code mean?
Severity : HighU0008 means the low line (CAN-) of the high speed CAN bus has a voltage that is too high. This bus links the main control modules, such as engine, transmission and ABS. A faulty line can disrupt all communication and trigger many warning lights and malfunctions.
Symptoms
- Many warning lights on the dashboard.
- Hard starting or no start.
- Engine or transmission limp mode.
- Several lost communication codes.
Possible causes
- CAN- line shorted to battery voltage or to CAN+.
- Pinched, chafed or water damaged wiring.
- Corroded control module connector.
- Faulty module disrupting the bus.
- Poorly wired aftermarket accessory on the network.
Diagnosis and repair
- Measure CAN+ and CAN- voltages at the diagnostic socket.
- Check bus termination resistance, about 60 ohms with the battery disconnected.
- Unplug modules one at a time to isolate the one disrupting the bus.
- Inspect the harness for chafing or moisture.
- Repair the wiring or replace the faulty module, then clear the codes.
Is this vehicle in your workshop?
Upload the ORI file: it is processed automatically in a few minutes, 24/7, and a calibration engineer takes over complex cases during opening hours.
Are you a driver?
Find a garage or a diagnostics and remapping specialist near you.
Find a pro on ChiptuneMAPCode details
Code
U0008
Category
Network
Prefix
U
Standard
OBD-II / SAE J2012