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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Automatic Transmission - 6T40 (MNH MNK) Or 6T45 (MHG) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0850, P0851, Or P0852: Park/Neutral Position Switch Circuit >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.
    NOTE:

    Circuit/System Testing must be performed before proceeding with Component Testing.

  1. Ignition/Vehicle - Off
  2. Connect all electrical connectors.
  3. Ignition - On / Vehicle - In Service Mode
  4. Operate the component:S3 Transmission Shift Lever - Select each position

    Verify the scan tool parameter:Internal Mode Switch A/B/C/P=The switch states match the values given in the table.Refer to: Transmission Internal Mode Switch Logic

    • If not the specified state 

      Replace the component:B15 Transmission Internal Mode Switch

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

    Verify the scan tool parameter:

    • Park/Neutral Position Switch@K20 Engine Control Module=Park/Neutral - S3 Transmission Shift Lever -P, N
    • Park/Neutral Position Switch=In Gear - S3 Transmission Shift Lever - R, D, M
    • If not the specified state 

      Replace the component:B15 Transmission Internal Mode Switch

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