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Home >> GMC >> 2021 >> Terrain SLT, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 247 (Automatic Transmission - 6T40 (MNH MNK) Or 6T45 (MHG) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0851 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2021 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P182E, P1915 is not set as a history DTC.
  3. Operate the component: S3 Transmission Shift Lever - Select each position

    Verify the scan tool parameter: Internal Mode Switch @ K71 Transmission Control Module = Matches the selector lever position

    • Go to next step: If the specified state 
  4. Operate the component: S3 Transmission Shift Lever - Select each position

    Verify the scan tool parameter:

    • { R, D, L } Park/Neutral Position Switch = In Gear
    • { P, N } Park/Neutral Position Switch = Park/Neutral
    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  5. 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 
  6. All OK.