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Home >> Buick >> 2019 >> Regal TourX Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 140 (Automatic Transmission - 9T50 (M3D) And 9T60 (M3T) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, P0826, or P1876 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S2 Transmission Manual Shift Switch
  3. Test for 5800 to 6400 ohms between the test points: Signal terminal 3 & Ground terminal 2
    • If not between 5800 and 6400 ohms 

      Replace the component: S2 Transmission Manual Shift Switch

    • Go to next step: If between 5800 and 6400 ohms 
  4. Operate the component: S3 Transmission Shift Lever = Forward
  5. Test for 575 to 700 ohms between the test points: Signal terminal 3 & Ground terminal 2
    • If not between 575 and 700 ohms 

      Replace the component: S2 Transmission Manual Shift Switch

    • Go to next step: If between 575 and 700 ohms 
  6. Operate the component: S3 Transmission Shift Lever = Rearward
  7. Test for 1900 to 2100 ohms between the test points: Signal terminal 3 & Ground terminal 2
    • If not between 1900 and 2100 ohms 

      Replace the component: S2 Transmission Manual Shift Switch

    • Go to next step: If between 1900 and 2100 ohms 
  8. All OK.
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