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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Automatic Transmission - 6T40 (MNH MNK) Or 6T45 (MHG) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0815, P0816, Or P0826: Up And Down Shift Switch Circuit >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Remove the component: Transmission Control Lever Knob
  3. Disconnect the electrical connector: S2 Transmission Manual Shift Switch
  4. Test for 5, 900 to 6, 400 ohms between the test points: Signal terminal A & Ground circuit terminal B
    • If not between 5, 900 and 6, 400 ohms 

      Replace the component: Transmission Control Lever Knob

    • Go to next step: If between 5, 900 and 6, 400 ohms 
  5. Press and hold the switch: S2 Transmission Manual Shift Switch - Downshift
  6. Test for 1, 900 to 2, 100 kohms between the test points: Signal terminal A & Ground circuit terminal B
    • If not between 1, 900 and 2, 100 ohms 

      Replace the component: Transmission Control Lever Knob

    • Go to next step: If between 1, 900 and 2, 100 ohms 
  7. Press and hold the switch: S2 Transmission Manual Shift Switch - Upshift
  8. Test for 600 to 660 ohms between the test points: Signal terminal A & Ground circuit terminal B
    • If not between 600 and 660 ohms 

      Replace the component: Transmission Control Lever Knob

    • Go to next step: If not between 600 and 660 ohms 
  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: Transmission Control Lever Knob

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