Back to 1998 Audi A6
Help
1998 AUDI A6
2.8L V6 (30-valve, ~200 hp) quattro•AWD•AUTOMATIC•gas•AZA•turbo
10 active safety recalls on this vehicle — view recalls
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor506Torque2232Fluid9DTC866Battery1Maintenance0Recalls10
U0402moderate severityNetwork

Invalid Data Received from TCM

on 1998 Audi A6 2.8L V6 (30-valve, ~200 hp) quattro · 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.

🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITE
Shop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other Network codes on this vehicle

🔌 Need this data in your app? It's all in the free API →
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years. Spot an error? Use the Help link above — a human reads every report.
Stuck on this repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Share:XRedditFBWhatsAppThreadsEmail
⚠ STILL BEHIND THE PAYWALL
The 1998 Audi A6 repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy — and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the Audi A6 — $99 →
Building an app?
Free API access to all this data — 10 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included.
Try ShopBase →