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Home >> Cadillac >> 2019 >> CTS Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 68 (Automatic Transmission - 8L45 (M5N) Or 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 2018 Cadillac CTS. 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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