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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Control System & Fuel System - 6.6L (LLY) - DTC P0401 To DTC P2510) >> DTC P0671-P0678 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Refer to Testing for Intermittent Conditions and Poor Connections if you cannot duplicate the conditions.
    • If DTC P064C is also set, diagnose DTC P064C first.
  2. Engine running, observe the DTC information with a scan tool. DTCs P0671-P0678 should not set.
  3. 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 Records data.
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