U0006high severityNetwork
High Speed CAN Communication Bus (-) Open
on 1998 Audi A6 2.7L Turbo V6 · AWD
What this code means
The CAN Low wire is open, disrupting high-speed CAN communication. CAN L carries the recessive low signal.
Symptoms
- Multiple modules lose communication
- Warning lights on
- Systems go offline intermittently
Common causes
- Broken CAN L wire
- Corroded CAN L terminal
- Connector damage
- Wiring harness break
Diagnostic steps
- Measure voltage on CAN L (should be ~2.5V idle, ~1.5V dominant)
- Check continuity of CAN L wire
- Inspect splice points and connectors
- Use scope to verify CAN L waveform
Repair notes
Locate and repair the open in the CAN L wire.
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00003
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01316
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01321
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U0001
High Speed CAN Communication Bus