U0112high severityNetwork
Lost Communication With ECM/PCM A
on 2014 Audi Q7 3.0L Supercharged V6 · AWD
What this code means
A module has lost communication with the engine/powertrain control module over the data bus. This usually points to a wiring or bus fault, or a failed control module.
Symptoms
- Engine stalls or won't start
- Multiple warning lights on dash
- Poor or no engine performance
Common causes
- Faulty CAN bus wiring or connectors
- Corroded or loose grounds
- Failed ECM/PCM
- Blown fuse or power supply issue
Diagnostic steps
- Scan all modules for stored codes
- Check ECM/PCM power and ground circuits
- Inspect CAN bus wiring for damage
- Test bus voltages and terminate resistance
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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