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2002 AUDI A6
3.0L V6•AWD•AUTOMATIC•gas•AVK
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor502Torque2211Fluid10DTC923Battery1Maintenance0Recalls4
U0402moderate severityNetwork

Invalid Data Received from TCM

on 2002 Audi A6 3.0L V6 · AWD

What this code means

The data received from the Transmission Control Module is invalid, out of range, or corrupted.

Symptoms

  • Transmission shifting issues
  • Erratic shift points
  • Check Engine Light
  • Transmission slip feeling
  • Limp mode

Common causes

  • TCM software glitch
  • CAN bus noise on TCM circuit
  • TCM internal failure
  • Bad ground connection
  • Wiring interference near TCM

Diagnostic steps

  1. Check TCM for stored codes
  2. Update TCM software
  3. Test CAN bus signal quality at TCM
  4. Inspect TCM ground connections
  5. Check for wiring damage near TCM

Repair notes

Reprogram TCM. Check CAN bus quality and TCM ground connections.

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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