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2007 AUDI S6
5.2L V10•AWD•AUTOMATIC•gas•BXA
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor489Torque4245Fluid7DTC1060Battery1Maintenance0Recalls2
P1388high severityPowertrain

Internal Control Module Knock Control Circuit

on 2007 Audi S6 5.2L V10 · AWD

What this code means

The ECU detected an internal fault in its knock control processing circuit. The knock sensor input is not being properly processed by the ECU, compromising engine knock protection.

Symptoms

  • Check Engine Light
  • Engine may run with reduced power
  • Possible engine knock under load
  • Safety timing retard applied

Common causes

  • ECU internal knock processing circuit failure
  • Knock sensor wiring interference
  • Poor ECU ground connection
  • Electrical noise from aftermarket components
  • ECU damage from voltage spike

Diagnostic steps

  1. Check knock sensor wiring for electromagnetic interference
  2. Inspect ECU ground connections
  3. Remove aftermarket electrical components temporarily
  4. Test knock sensor signal quality
  5. Consider ECU replacement if fault is internal

Repair notes

Address external interference sources first; replace ECU if internal circuit has failed.

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