U0304moderate severityNetwork
Software Incompatibility with Cruise Control Module
on 2005 Audi A6 4.2L V8 · AWD
What this code means
Software incompatibility with the cruise control system causing data errors.
Symptoms
- Cruise control erratic
- Adaptive cruise not engaging
- Speed set point drifting
- Cruise control disabling unexpectedly
Common causes
- Cruise module software outdated
- Software conflict after update
- Module version mismatch
Diagnostic steps
- Check cruise control module software version
- Update module software
- Check for known software conflicts
- Verify module compatibility
Repair notes
Update cruise control module software to version compatible with other vehicle modules.
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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
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01318
Immobilizer Control Module - No Communication
01321
Airbag Control Module - No Communication
U0001
High Speed CAN Communication Bus