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Home >> GMC >> 2021 >> Terrain SLT, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 91 (Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0658, P0659, P2727, P2729, P2730, P2736, P2738, P2739, P2826, P2827, P282F, or P2830 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2020 GMC Terrain and 2020 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - On
  2. Engine - Running
  3. Verify the scan tool parameter:
    • High Side Driver 1 Circuit Open Test Status = Not Run or OK
    • High Side Driver 1 Circuit Low Voltage Test Status = Not Run or OK
    • High Side Driver 1 Circuit High Voltage Test Status = Not Run or OK
    • Transmission Control Solenoid Valve 5, 6, 9, 10 Control Circuit Open Test Status = Not Run or OK
    • Transmission Control Solenoid Valve 5, 6, 9, 10 Control Circuit Low Voltage Test Status = Not Run or OK
    • Transmission Control Solenoid Valve 5, 6, 9, 10 Control Circuit High Voltage Test Status = Not Run or OK
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  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.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  5. All OK.
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