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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0016-P0401)) >> DTC P0300 - P0308 >> Circuit/System Testing

Circuit/System Testing

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  1. Unplug the fuel injector for the cylinder that indicated the misfire.
  2. Start the engine. Record the DTCs that set. The appropriate injector control circuit DTC P0201 -P0208 should set.
    • If the appropriate injector control circuit DTC did not set replace the ECM.
  3. Reconnect the injector and clear the DTCs. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records List.