U0008high severityNetwork
High Speed CAN Communication Bus (-) High
on 2017 Audi Q7 3.0L V6 TFSI · AWD
What this code means
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.
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Other Network codes on this vehicle
00003
Control Module - Defective
01304
Radio - No Communication
01312
Powertrain Data Bus - Defective
01314
Engine Control Module (ECM) - no communications
01315
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01316
ABS Control Module - No Communication
01317
Instrument Cluster Control Module (J285) - No Communication
01318
Immobilizer Control Module - No Communication
01321
Airbag Control Module - No Communication
U0001
High Speed CAN Communication Bus