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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Automatic Transmission - 8L90 (M5U) - 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 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the correct adjustment: Range Selector Lever Cable - Refer to: Range Selector Lever Cable Adjustment
    • If not adjusted correctly 

      Adjust the shift lever and selector lever cable.

    • Go to next step: If adjusted correctly 
  2. Ignition - On / Vehicle - In Service Mode
  3. Verify the scan tool parameter: Park/Neutral Position Switch
    • Park/Neutral - When in the following mode/position: Park or Neutral
    • In Gear - When in the following mode/position: Drive or Reverse
    • 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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