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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0960, P0962, P0962, P0964, P0966, P0967, P0968, P0970, P0971, P2736, P2738, P2739, P2812, P2814, P2815, P2824, P2826, Or P2827: Transmission Control Solenoid Valve 1, 2, 3, 6, 7, 9 Control Circuit(s) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: X175 @ T12 Automatic Transmission Assembly
  3. Connect a test lamp between the test points: High Side Driver 2 - Control circuit terminal 19 & Ground
  4. Ignition - On/Vehicle - In Service Mode
  5. Perform the scan tool control function: High Side Driver 2 - On and Off

    Verify the test lamp turns On and Off.

    • Go to next step: If the test lamp turns On and Off 
  6. Remove - Test Lamp
  7. Ignition/Vehicle - Off
  8. Disconnect the electrical connector: K71 Transmission Control Module
  9. Test for less than 2 ohms between the test points:
    • {P0960, P0962, P0963} Control circuit terminal 5 & Terminal 18 @ Control module harness
    • {P0964, P0966, P0967} Control circuit terminal 6 & Terminal 2 @ Control module harness
    • {P0968, P0970, P0971} Control circuit terminal 10 & Terminal 19 @ Control module harness
    • {P2736, P2738, P2739} Control circuit terminal 4 & Terminal 3 @ Control module harness
    • {P2812, P2814, P2815} Control circuit terminal 3 & Terminal 20 @ Control module harness
    • {P2824, P2826, P2827} Control circuit terminal 7 & Terminal 22 @ Control module harness
    • If greater than 2 ohms 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 ohms 
  10. Test for infinite resistance between the test points:
    • {P0960, P0962, P0963} Control circuit terminal 5 & Ground
    • {P0964, P0966, P0967} Control circuit terminal 6 & Ground
    • {P0968, P0970, P0971} Control circuit terminal 10 & Ground
    • {P2736, P2738, P2739} Control circuit terminal 4 & Ground
    • {P2812, P2814, P2815} Control circuit terminal 3 & Ground
    • {P2824, P2826, P2827} Control circuit terminal 7 & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  11. Ignition - On/Vehicle - In Service Mode
  12. Test for less than 1 V between the test points:
    • {P0960, P0962, P0963} Control circuit terminal 5 & Ground
    • {P0964, P0966, P0967} Control circuit terminal 6 & Ground
    • {P0968, P0970, P0971} Control circuit terminal 10 & Ground
    • {P2736, P2738, P2739} Control circuit terminal 4 & Ground
    • {P2812, P2814, P2815} Control circuit terminal 3 & Ground
    • {P2824, P2826, P2827} Control circuit terminal 7 & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  13. Ignition/Vehicle - Off
  14. Remove the component: Automatic Transmission Fluid Pan
  15. Connect the electrical connector: X175 @ T12 Automatic Transmission Assembly
  16. Disconnect the appropriate electrical connector:
    • {P0960, P0962, P0963} Q77A Transmission Control Solenoid Valve 1
    • {P0964, P0966, P0967} Q77B Transmission Control Solenoid Valve 2
    • {P0968, P0970, P0971} Q77C Transmission Control Solenoid Valve 3
    • {P2736, P2738, P2739} Q77F Transmission Control Solenoid Valve 6
    • {P2812, P2814, P2815} Q77G Transmission Control Solenoid Valve 7
    • {P2824, P2826, P2827} Q77J Transmission Control Solenoid Valve 9
  17. Ignition - On/Vehicle - In Service Mode
  18. Test for less than 1 V between the test points:
    • {P0960, P0962, P0963} Control circuit terminal 18 @ Control module harness & Ground
    • {P0964, P0966, P0967} Control circuit terminal 2 @ Control module harness & Ground
    • {P0968, P0970, P0971} Control circuit terminal 19 @ Control module harness & Ground
    • {P2736, P2738, P2739} Control circuit terminal 3 @ Control module harness & Ground
    • {P2812, P2814, P2815} Control circuit terminal 20 @ Control module harness & Ground
    • {P2824, P2826, P2827} Control circuit terminal 22 @ Control module harness & Ground
    • If 1 V or greater 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If less than 1 V 
  19. Ignition/Vehicle - Off
  20. Test for infinite resistance between the test points:
    • {P0960, P0962, P0963} Control circuit terminal 18 @ Control module harness & Ground
    • {P0964, P0966, P0967} Control circuit terminal 2 @ Control module harness & Ground
    • {P0968, P0970, P0971} Control circuit terminal 19 @ Control module harness & Ground
    • {P2736, P2738, P2739} Control circuit terminal 3 @ Control module harness & Ground
    • {P2812, P2814, P2815} Control circuit terminal 20 @ Control module harness & Ground
    • {P2824, P2826, P2827} Control circuit terminal 22 @ Control module harness & Ground
    • If less than infinite resistance 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If infinite resistance 
  21. Test or replace the component: Q77 Transmission Control Solenoid Valve
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