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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1660 (Engine Control System & Fuel System - 6.6L (LMM) - DTC P02E8 To DTC P1247) >> DTC P0671-P0678 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that DTC P064C is not set.
  2. Ignition ON, engine OFF, observe the scan tool Glow Plug 1-Glow Plug 8 parameters. All Glow Plug parameters should closely match each other.
  3. Refer to Testing for Intermittent Conditions and Poor Connections if you cannot duplicate the conditions.
  4. Engine running, observe the DTC information with a scan tool. DTCs P0671-P0678 should not set.
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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