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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Transmission - 10L80 (MF6) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0960, P0962, P0963, P0964, P0966, P0967, P0968, P0970, P0971, P2670, P2671, P2718, P2720, P2721, P2727, P2729, P2730, P2736, P2738, P2739, P2824, P2826 Or P2827: Transmission Control Solenoid Valve 1-6 Control Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Cadillac Escalade ESV, and 2018 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: X1 @T12 Automatic Transmission Assembly
  3. Connect a test lamp between the test points:Control circuit terminal 9 @Component harness & 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.

    • If the test lamp is always Off 
    1. Connect the electrical connector: X1 @T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the electrical connector:
      • K71 Transmission Control Module
      • X1 @T12 Automatic Transmission Assembly
    4. Test for infinite resistance between the test points:Control circuit terminal 9 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    5. Test for less than 2 ohms between the test points:Control circuit terminal 9 @ Component harness & Terminal 49 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K71 Transmission Control Module
    • If the test lamp is always On 
    1. Connect the electrical connector: X1 @T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the electrical connector:
      • K71 Transmission Control Module
      • X1 @T12 Automatic Transmission Assembly
    4. Ignition - On / Vehicle - In Service Mode
    5. Test for less than 1 V between the test points:Control circuit terminal 9 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K71 Transmission Control Module
    • Go to next step: If the test lamp turns On and Off 
  6. Connect the electrical connector: X1 @T12 Automatic Transmission Assembly
  7. Ignition/Vehicle - Off
  8. Disconnect the electrical connector:
    • K71 Transmission Control Module
    • X1 @T12 Automatic Transmission Assembly
  9. Test for less than 2 ohms between the test points:
    • { P0960, P0962, P0963 }Control circuit terminal 14 @ Component harness & Terminal 18 @ Control module harness
    • { P0964, P0966, P0967 }Control circuit terminal 15 @ Component harness & Terminal 2 @ Control module harness
    • { P0968, P0970, P0971 }Control circuit terminal 16 @ Component harness & Terminal 19 @ Control module harness
    • { P2718, P2720, P2721 }Control circuit terminal 21 @ Component harness & Terminal 20 @ Control module harness
    • { P2727, P2729, P2730}Control circuit terminal 22 @ Component harness & Terminal 3 @ Control module harness
    • { P2736, P2738, P2739 }Control circuit terminal 23 @ Component harness & Terminal 4 @ Control module harness
    • If 2 ohms or greater 

      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 14 @ Component harness & Ground
    • { P0964, P0966, P0967 }Control circuit terminal 15 @ Component harness & Ground
    • { P0968, P0970, P0971 }Control circuit terminal 16 @ Component harness & Ground
    • { P2718, P2720, P2721 }Control circuit terminal 21 @ Component harness & Ground
    • {P2727, P2729, P2730 }Control circuit terminal 22 @ Component harness & Ground
    • { P2736, P2738, P2739 }Control circuit terminal 23 @ Component harness & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  11. Test for infinite resistance between the test points:Control circuit terminal 49 @Control module harness &
    • { P0960, P0962, P0963, P2670, P2671} Terminal 18 @Control module harness
    • { P0964, P0966, P0967 } Terminal 2 @Control module harness
    • { P0968, P0970, P0971 }Terminal 19 @Control module harness
    • { P2718, P2720, P2721 }Terminal 20 @Control module harness
    • {P2727, P2729, P2730 }Terminal 3 @Control module harness
    • { P2736, P2738, P2739 }Terminal 4 @Control module harness
    • If less than infinite resistance 

      Repair the short between the circuits.

    • Go to next step: If infinite resistance 
  12. Ignition - On / Vehicle - In Service Mode
  13. Test for less than 1 V between the test points:
    • {P0960, P0962, P0963 }Control circuit terminal 14 @ Component harness & Ground
    • { P0964, P0966, P0967 }Control circuit terminal 15 @ Component harness & Ground
    • { P0968, P0970, P0971 }Control circuit terminal 16 @ Component harness & Ground
    • { P2718, P2720, P2721 }Control circuit terminal 21 @ Component harness & Ground
    • { P2727, P2729, P2730 }Control circuit terminal 22 @ Component harness & Ground
    • { P2736, P2738, P2739 }Control circuit terminal 23 @ Component harness & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  14. Connect the electrical connector: X1@T12 Automatic Transmission Assembly
  15. Ignition/Vehicle - Off
  16. Remove the component:Transmission Cover
  17. Disconnect the electrical connector:Q77 Transmission Control Solenoid Valve
  18. Test for less than 2 ohms between the test points:Control circuit terminal 49 &
    • { P0960, P0962, P0963, P2670, P2671 } Terminal 1 @Q77A Transmission Control Solenoid Valve 1 - Electrical Connector
    • { P0964, P0966, P0967 } Terminal 1 @Q77B Transmission Control Solenoid Valve 2 - Electrical Connector
    • { P0968, P0970, P0971 }Terminal 1 @Q77C Transmission Control Solenoid Valve 3 - Electrical Connector
    • { P2718, P2720, P2721 }Terminal 1 @Q77D Transmission Control Solenoid Valve 4 - Electrical Connector
    • { P2727, P2729, P2730}Terminal 1 @Q77E Transmission Control Solenoid Valve 5 - Electrical Connector
    • { P2736, P2738, P2739 }Terminal 1 @Q77F Transmission Control Solenoid Valve 6 - Electrical Connector
    • If 2 ohms or greater 

      Replace the component:Automatic Transmission Wiring Harness

    • Go to next step: If less than 2 ohms 
  19. Test for infinite resistance between the test points:Control circuit terminal 49 & Ground
    • If less than infinite resistance 

      Replace the component:Automatic Transmission Wiring Harness

    • Go to next step: If infinite resistance 
  20. Test for less than 2 ohms between the test points:
    • { P0960, P0962, P0963 } Terminal 2 @Q77A Transmission Control Solenoid Valve 1 - Electrical Connector & Control circuit terminal 18 @K71 Transmission Control Module
    • { P0964, P0966, P0967 } Terminal 2 @Q77B Transmission Control Solenoid Valve 2 - Electrical Connector & Control circuit terminal 2 @K71 Transmission Control Module
    • { P0968, P0970, P0971} Terminal 2 @Q77C Transmission Control Solenoid Valve 3 - Electrical Connector & Control circuit terminal 19 @K71 Transmission Control Module
    • { P2718, P2720, P2721 } Terminal 2 @Q77D Transmission Control Solenoid Valve 4 - Electrical Connector & Control circuit terminal 20 @K71 Transmission Control Module
    • { P2727, P2729, P2730} Terminal 2 @Q77E Transmission Control Solenoid Valve 5 - Electrical Connector & Control circuit terminal 3 @K71 Transmission Control Module
    • { P2736, P2738, P2739 } Terminal 2 @Q77F Transmission Control Solenoid Valve 6 - Electrical Connector & Control circuit terminal 4 @K71 Transmission Control Module
    • If 2 ohms or greater 

      Replace the component:Automatic Transmission Wiring Harness

    • Go to next step: If less than 2 ohms 
  21. Test for infinite resistance between the test points:Ground &
    • { P0960, P0962, P0963 } Terminal 1 @Q77A Transmission Control Solenoid Valve 1 - Electrical Connector
    • { P0964, P0966, P0967 } Terminal 1 @Q77B Transmission Control Solenoid Valve 2 - Electrical Connector
    • { P0968, P0970, P0971}Terminal 1 @Q77C Transmission Control Solenoid Valve 3 - Electrical Connector
    • { P2718, P2720, P2721 }Terminal 1 @Q77D Transmission Control Solenoid Valve 4 - Electrical Connector
    • { P2727, P2729, P2730}Terminal 1 @Q77E Transmission Control Solenoid Valve 5 - Electrical Connector
    • { P2736, P2738, P2739}Terminal 1 @Q77F Transmission Control Solenoid Valve 6 - Electrical Connector
    • If less than infinite resistance 

      Replace the component:Automatic Transmission Wiring Harness

    • Go to next step: If infinite resistance 
  22. Test for infinite resistance between the test points:Control circuit terminal 49 @Control module harness &
    • { P0960, P0962, P0963, P2670, P2671} Terminal 18 @Control module harness
    • { P0964, P0966, P0967 } Terminal 2 @Control module harness
    • { P0968, P0970, P0971 }Terminal 19 @Control module harness
    • { P2718, P2720, P2721}Terminal 20 @Control module harness
    • {P2727, P2729, P2730 }Terminal 3 @Control module harness
    • { P2736, P2738, P2739 }Terminal 4 @Control module harness
    • If less than infinite resistance 

      Replace the component:Automatic Transmission Wiring Harness

    • Go to next step: If infinite resistance 

      Test or replace the component:Q77 Transmission Control Solenoid Valve

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