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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1375 (Engine Controls And Fuel - 6.6L - DTC P02E8 To DTC P1247) >> DTC P1224, P1227, P122A, P1233, P1236, P1239, P1242, or P1247 >> Circuit/System Testing >> One Fuel Injector DTC Sets

One Fuel Injector DTC Sets

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the affected fuel injector connector.
  2. Turn ON the ignition with the engine OFF.
  3. Connect a test lamp between the affected fuel injector control circuit and a ground. The test lamp should not illuminate.
    • If the test lamp illuminates, test the fuel injector control circuit for a short to voltage.
  4. Connect a test lamp between the affected fuel injector control circuit and battery voltage. The test lamp should not illuminate.
    • If the test lamp illuminated, test the fuel injector control circuit for a short to ground.
  5. Test the affected group injector positive voltage control circuit for a short to ground or a short to voltage.
  6. Test the affected fuel injector for high resistance. Refer to Component Testing  in this diagnostic.
  7. If the circuits tested normal, replace the ECM.
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