U0113moderate severityNetwork
Lost Communication With Emissions Control Unit A
on 2019 Audi Q7 3.0L V6 TFSI · AWD
What this code means
A module can no longer talk to the emissions control unit on the data network. Often caused by wiring problems or a failed emissions module.
Symptoms
- Check engine light on
- Emissions-related codes set
- Possible reduced performance
Common causes
- Faulty bus wiring or connectors
- Poor ground connection
- Failed emissions control unit
- Fuse or power supply fault
Diagnostic steps
- Scan for communication codes in all modules
- Verify power and ground to emissions unit
- Inspect CAN wiring and connectors
- Measure bus voltages for faults
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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
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