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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 506 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0601, P0603, P0604, or P062F >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition OFF for one minute.
  2. Ignition ON, verify with a scan tool that DTCs P0601, P0603, P0604, or P062F are not set.
    • If DTCs P0601, P0603, P0604, or P062F are set 

      Replace the control solenoid valve and transmission control module assembly.

    • If DTCs P0601, P0603, P0604 or P062F are not set 
  3. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Refer to Testing for Intermittent Conditions and Poor Connections .
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