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2009 GMC ENVOY
4.2L I6•4WD•AUTOMATIC•gas
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Repairs0Labor985Torque9299Fluid18DTC3914Battery2Maintenance0Recalls0
P1300high severityPowertrain

Ignitor Circuit Malfunction

on 2009 GMC Envoy 4.2L I6 · 4WD

What this code means

The PCM detected a malfunction in the ignition ignitor circuit. The ignitor is part of the ignition module that controls spark timing and delivery.

Symptoms

  • Check Engine Light
  • Engine misfires
  • Rough running
  • No start condition
  • Loss of power

Common causes

  • Faulty ignition module
  • Damaged ignition coil
  • Wiring issue to ignition module
  • PCM failure
  • Poor ground connection

Diagnostic steps

  1. Test ignition module output
  2. Inspect ignition coils
  3. Check wiring to ignition module
  4. Verify ground connections
  5. Test PCM ignition output signals

Repair notes

Replace faulty ignition module or coil. Check grounds and wiring first.

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