U0031high severityNetwork
Control Module Communication Bus C Shorted To Bus C High
on 2011 Audi Q7 3.0L Supercharged V6 · AWD
What this code means
The low side of bus C is shorted to the high side, corrupting network signals. This blocks reliable communication among control modules.
Symptoms
- Multiple warning lights
- Systems not responding
- Erratic electrical behavior
Common causes
- Bus C wires shorted together
- Pinched or chafed harness
- Moisture in connectors
- Faulty module shorting the bus
Diagnostic steps
- Scan network for faults
- Inspect bus C wiring for shorts
- Check connectors for corrosion and water
- Disconnect modules to isolate fault
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00003
Control Module - Defective
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01312
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01314
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01315
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01316
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01317
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01318
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01321
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U0001
High Speed CAN Communication Bus