01314critical severityNetwork
Engine Control Module (ECM) - no communications
on 2012 Audi A5 2.0L TFSI Turbo I4 (211 hp) · AWD
What this code means
Another module cannot communicate with the ECM over the data bus. This points to a network fault or a dead ECM.
Symptoms
- Engine no start or runs poorly
- Multiple modules report faults
- No data from engine module
Common causes
- Faulty ECM power or ground
- CAN bus wiring fault
- Blown ECM fuse
- Failed ECM
Diagnostic steps
- Check ECM fuses and power supply
- Verify ECM ground connections
- Test CAN bus wiring for shorts or opens
- Scan all modules for communication status
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U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance