U0008
High Speed CAN Communication Bus (-) High
2019-2024 BMW 3 Series G20 2.0L I4 Turbo B48
High SeverityNetworkGeneric (SAE)
Description
The CAN Low wire voltage is higher than expected, indicating a short to power.
Symptoms
- CAN bus failure
- Multiple communication errors
- Systems unresponsive
Common Causes
- CAN L shorted to battery voltage
- Wiring harness damage
- Module fault driving CAN L high
Diagnostic Steps
- Measure CAN L voltage
- Disconnect modules to isolate
- Inspect wiring for shorts to power circuits
- Check harness routing near power wires
Repair Notes
Repair CAN L short to power. Ensure CAN wiring is properly separated from power wiring.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
- U0028Vehicle Communication Bus A Performance
U0008 on Other Vehicles
Common Questions
What does code U0008 mean on a 2019-2024 BMW 3 Series G20?
U0008 stands for "High Speed CAN Communication Bus (-) High". The CAN Low wire voltage is higher than expected, indicating a short to power.
What are the symptoms of U0008 on a BMW 3 Series G20?
Common symptoms of U0008 include: CAN bus failure, Multiple communication errors, Systems unresponsive.
What causes U0008 on a 2019-2024 BMW 3 Series G20?
Common causes of U0008 include: CAN L shorted to battery voltage, Wiring harness damage, Module fault driving CAN L high.