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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1640 (Engine Control System & Fuel System - 4.3L - DTC P0340 To DTC P2544) >> DTC P0601, P0602, P0603, P0604, P0606, P0607, P060D, P062F, or P2610 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Test the voltage and ground inputs to the K20 ECM for the following:
    • A short
    • An open
    • High resistance
  2. Observe the DTCs with a scan tool.
    • If DTC P0602 is set, attempt to program the K20 ECM before replacing the K20 ECM. Refer to Control Module References for K20 ECM replacement, setup, and programming.
    • If DTC P0602 resets, replace the K20 ECM.
  3. Observe the DTC information with a scan tool. DTC P0601, P0603, P0604, P0605, P0606, P0607, P060D, P062F, or P2610 should not set.
    • If a DTC failed this ignition, replace the K20 ECM.
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