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2007 AUDI A8
4.2L V8•AWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor488Torque2170Fluid9DTC1060Battery1Maintenance0Recalls2
U0102high severityNetwork

Lost Communication with Transfer Case Control Module

on 2007 Audi A8 4.2L V8 · AWD

What this code means

Cannot communicate with the transfer case control module that manages AWD/4WD operation.

Symptoms

  • 4WD/AWD warning light on
  • Transfer case stuck in mode
  • Cannot switch between 2WD and 4WD
  • Service 4WD message

Common causes

  • Transfer case module power failure
  • CAN bus wiring to module
  • Transfer case module failure
  • Fuse blown
  • Connector corrosion

Diagnostic steps

  1. Check transfer case module fuse
  2. Test module power and ground
  3. Inspect CAN bus wiring to module
  4. Try direct communication with module
  5. Check connector for corrosion

Repair notes

Check fuses and power supply first. Common on trucks after water fording.

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