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Home >> GMC >> 2017 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 197 (Automatic Transmission - 8L45 (M5N M5T) Or 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0851: Park/Neutral Position Switch >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the range selector lever cable adjustment is correct. Refer to Range Selector Lever Cable Adjustment .
    • If the range selector lever cable adjustment is not OK 

      Adjust, repair or replace as necessary.

    • If the range selector lever cable adjustment is OK 
  2. Ignition On.
  3. Verify the scan tool Engine Control Module Park/Neutral Position Switch parameter displays Park/Neutral when in Park or Neutral and In Gear when in Reverse or Drive range.
    • If Park/Neutral or In Gear is not displayed correctly 

      Refer to Circuit/System Testing.

    • If Park/Neutral or In Gear is displayed correctly 
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

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