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2009 GMC ENVOY
4.2L I6•4WD•AUTOMATIC•gas
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Repairs0Labor985Torque9299Fluid18DTC3908Battery2Maintenance0Recalls0
P1350high severityPowertrain

Ignition Control System

on 2009 GMC Envoy 4.2L I6 · 4WD

What this code means

The PCM detected a general malfunction in the ignition control system. This code indicates the PCM is not receiving the expected feedback from the ignition module.

Symptoms

  • Check Engine Light
  • Engine misfires on multiple cylinders
  • Rough running
  • No start
  • Loss of power

Common causes

  • Faulty ignition control module
  • Damaged ignition coil pack
  • Wiring issue between PCM and IC module
  • PCM failure
  • Poor ground connection

Diagnostic steps

  1. Test ignition module output with scope
  2. Inspect ignition coils
  3. Check wiring between PCM and IC module
  4. Verify power and ground to IC module
  5. Test each coil primary circuit

Repair notes

Replace ignition control module or coil assembly. Check power, grounds, and wiring.

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