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2018 AUDI A6
3.0L Supercharged V6•AWD•AUTOMATIC•gas•supercharged
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor507Torque3472Fluid7DTC1143Battery1Maintenance0Recalls2
U0108moderate severityNetwork

Lost Communication with Exhaust Gas Recirculation Module

on 2018 Audi A6 3.0L Supercharged V6 · AWD

What this code means

Cannot communicate with the EGR system control module.

Symptoms

  • Check Engine Light
  • Increased NOx emissions
  • EGR-related DTCs
  • Poor fuel economy
  • Rough idle

Common causes

  • EGR module failure
  • CAN bus wiring issue
  • Fuse blown
  • Connector corrosion
  • Carbon buildup causing module damage

Diagnostic steps

  1. Check EGR module fuse
  2. Test power and ground
  3. Inspect CAN wiring
  4. Check connector condition
  5. Test EGR module directly

Repair notes

Check fuses and wiring. EGR modules on diesels are prone to carbon contamination.

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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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