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2005 VOLVO S80
2.9L I6•AWD•AUTOMATIC•gas•B6294S
6 active safety recalls on this vehicle — view recalls
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Repairs0Labor1007Torque6617Fluid17DTC1930Battery2Maintenance0Recalls6
B0420moderate severityBody

Check Engine Lamp Circuit

on 2005 Volvo S80 2.9L I6 · AWD

What this code means

Malfunction in the check engine/MIL indicator lamp circuit in the instrument cluster.

Symptoms

  • Check engine light does not illuminate during bulb check
  • Light stays on with no DTC stored
  • Light flickering
  • Cannot determine if engine codes are present

Common causes

  • Burnt out MIL bulb/LED
  • Cluster circuit board fault
  • Wiring from PCM to cluster damaged
  • PCM MIL driver failure

Diagnostic steps

  1. Check bulb during key-on bulb check
  2. Test MIL drive circuit from PCM
  3. Inspect cluster wiring
  4. Scan PCM for codes
  5. Test cluster LED

Repair notes

Replace MIL bulb/LED in cluster or repair wiring from PCM to cluster.

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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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