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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 >> Component Testing

Component Testing

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. Ignition/Vehicle - Off
  2. Remove the component: Automatic Transmission Fluid Pan
  3. Disconnect the electrical connector: B15 Transmission Internal Mode Switch
  4. Test the resistance between the test points: Control terminal 1 & Ground terminal 2

    Verify the resistance between the terminals listed in the table below.

    • Park/Neutral = Less than 2 ohms
    • Reverse = Infinite resistance
    • Drive = Infinite resistance
    • Low = Infinite resistance
    • If not the specified value 

      Replace the component: B15 Transmission Internal Mode Switch

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