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Home >> Buick >> 2016 >> Envision >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission - 6T50 (M2D) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P0601, P0603, P0604, or P062F: Control Module Read Only Memory >> Circuit/System Verification
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Circuit/System Verification

    CAUTION:

    Before programming a control module, the following must be observed, or control module damage may occur:

    • The TIS terminal, MDI, and/or scan tool must have the latest software.
    • The vehicle battery must be fully charged. The battery voltage should be between 12-14 volts.
    • The TIS terminal, MDI, and/or scan tool connections must be secure.
    • A battery charger must NOT be connected to the battery when programming a control module.
  1. Ignition OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.
  2. Ignition ON.
  3. Verify that DTC P0601, P0603, P0604, or P062F is not set.
    • If any of the DTCs are set 

      Replace the Q8 Control Solenoid Valve Assembly.

    • If none of the DTCs are set  
  4. 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.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Replace the Q8 Control Solenoid Valve Assembly.

    • If the DTC does not set 
  6. All OK.
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