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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P040B - P204D)) >> Diagnostic Information And Procedures >> DTC P066A, P066B, P066C, P066D, P066E, P066F, P0671, P0672, P0673, P0674, P067A Or P067B: Cylinder 1-4 Glow Plug Control Circuit >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition Off.
  2. Disconnect the harness connector of the appropriate glow plug.
  3. Test for less than 2 Ω between glow plug terminal and the component's housing.
    • If the resistance is more than 2 Ω 

      Replace the affected glow plug.

    • Go to next step: If the resistance is less than 2 Ω 
  4. All OK.
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