U0137high severityNetwork
Lost Communication With TCM
on 2005-2011 Audi A6 4.2L V8 · AWD
What this code means
A module has lost communication with the transmission control module on the data bus. This can cause shifting problems or a transmission fault mode.
Symptoms
- Harsh or no shifting
- Transmission warning light
- Stuck in limp mode
Common causes
- Faulty bus wiring or connectors
- Poor ground connection
- Failed TCM
- Blown fuse or power issue
Diagnostic steps
- Scan all modules for codes
- Check TCM power and ground circuits
- Inspect CAN wiring for damage
- Test bus voltages and 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