U0118high severityNetwork
Lost Communication with Alternator/Generator Module
on 2010 Audi Q7 3.0L TDI V6 · AWD
What this code means
Cannot communicate with the smart alternator or integrated starter-generator module.
Symptoms
- Battery warning light
- Charging system malfunction
- Battery not charging
- Voltage fluctuations
- Stop-start system disabled
Common causes
- Smart alternator failure
- CAN bus wiring to alternator
- LIN bus issue
- Alternator connector corrosion
- Voltage regulator failure
Diagnostic steps
- Check alternator fuse
- Test alternator output voltage
- Check CAN/LIN wiring to alternator
- Inspect alternator connector
- Test alternator with direct command
Repair notes
Modern smart alternators communicate on CAN or LIN bus. Check wiring and connector at alternator.
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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
Transmission Control Module (TCM) - No Communication
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