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Home >> GMC >> 2022 >> Terrain AT4 >> Repair and Diagnosis >> External Pages >> Different car >> Section 335 (Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826 (without EPH) >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2021 GMC Terrain. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Remove the component: Transmission Control Lever Knob
  3. Disconnect the electrical connector: S3 Transmission Shift Lever
  4. Test for 5900 to 6400 Ω between the test points: Signal terminal 3 & Ground circuit terminal 2
    • If not between 5900 and 6400 Ω 

      Replace the component: S2A Transmission Manual Shift Switch - Up/Down

    • Go to next step: If between 5900 and 6400 Ω 
  5. Press and hold the switch: S2A Transmission Manual Shift Switch - Up/Down - Downshift
  6. Test for 1900 to 2100 kΩ between the test points: Signal terminal 3 & Ground circuit terminal 2
    • If not between 1900 and 2100 Ω 

      Replace the component: S2A Transmission Manual Shift Switch - Up/Down

    • Go to next step: If between 1900 and 2100 Ω 
  7. Press and hold the switch: S2A Transmission Manual Shift Switch - Up/Down - Upshift
  8. Test for 600 to 660 Ω between the test points: Signal terminal 3 & Ground circuit terminal 2
    • If not between 600 and 660 Ω 

      Replace the component: S2A Transmission Manual Shift Switch - Up/Down

    • Go to next step: If not between 600 and 660 Ω 
  9. Test for infinite resistance between the test points: Each terminal of the component & The component's housing
    • If less than infinite resistance 

      Replace the component: S2A Transmission Manual Shift Switch - Up/Down

    • Go to next step: If infinite resistance 
  10. All OK.
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