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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Automatic Transmission - 9T50 (M3E) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0960, P0962-P0964, P0966-P0968, P0970, P0971, P2670, P2671, P2718, P2720, P2721, P2812, P2814, P2815, P281B, P281D, or P281E >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: T12 Automatic Transmission Assembly
    3. NOTE:

    All testing for this procedure is performed on the control module K71 side of the circuit.

  3. Connect a test lamp between the test points: Control circuit terminal 28 & Ground
  4. Ignition - On / Vehicle - In Service Mode
    5. NOTE:

    If unable to perform the scan tool control function due to Device Limits Exceeded and/or DTC Present, jumper the component B14A circuits between the component T12 connector and the X1 harness connector. - Connect a 3 A fused jumper wire between the test points:

    • 9 V Reference circuit terminal 7 X1 (harness side) & 9 V Reference circuit terminal 7 X1 (component side)
    • Signal circuit terminal 6 X1 (harness side) & Signal circuit terminal 6 X1 (component side)
  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: T12 Automatic Transmission Assembly
    2. Ignition/Vehicle - Off
    3. Disconnect the electrical connector:
      • K71 Transmission Control Module
      • T12 Automatic Transmission Assembly
    4. Test for infinite resistance between the test points: Control circuit terminal 28 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    5. Test for less than 2 ohms between the test points: Control circuit terminal 28 @ 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
      • 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 28 @ 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: T12 Automatic Transmission Assembly
  7. Ignition/Vehicle - Off
  8. Disconnect the electrical connector:
    • K71 Transmission Control Module
    • T12 Automatic Transmission Assembly
  9. Test for less than 2 ohms between the test points:
    • { P0960, P0962, P0963 } Control circuit terminal 26 @ Component harness & Terminal 19 @ Control module harness
    • { P0964, P0966, P0967 } Control circuit terminal 27 @ Component harness & Terminal 3 @ Control module harness
    • { P0968, P0970, P0971 } Control circuit terminal 12 @ Component harness & Terminal 20 @ Control module harness
    • { P2718, P2720, P2721 } Control circuit terminal 25 @ Component harness & Terminal 4 @ Control module harness
    • { P2812, P2814, P2815 } Control circuit terminal 24 @ Component harness & Terminal 18 @ Control module harness
    • { P281B, P281D, P281E } Control circuit terminal 14 @ Component harness & Terminal 2 @ 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 26 @ Component harness & Ground
    • { P0964, P0966, P0967 } Control circuit terminal 27 @ Component harness & Ground
    • { P0968, P0970, P0971 } Control circuit terminal 12 @ Component harness & Ground
    • { P2718, P2720, P2721 } Control circuit terminal 25 @ Component harness & Ground
    • { P2812, P2814, P2815 } Control circuit terminal 24 @ Component harness & Ground
    • { P281B, P281D, P281E } Control circuit terminal 14 @ Component harness & 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 26 @ Component harness & Ground
    • { P0964, P0966, P0967 } Control circuit terminal 27 @ Component harness & Ground
    • { P0968, P0970, P0971 } Control circuit terminal 12 @ Component harness & Ground
    • { P2718, P2720, P2721 } Control circuit terminal 25 @ Component harness & Ground
    • { P2812, P2814, P2815 } Control circuit terminal 24 @ Component harness & Ground
    • { P281B, P281D, P281E } Control circuit terminal 14 @ 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 
  13. Connect the electrical connector: T12 Automatic Transmission Assembly
  14. Ignition/Vehicle - Off
  15. Disconnect the electrical connector: T12 Automatic Transmission Assembly
  16. Remove the component: Transmission Cover
  17. Connect the electrical connector: T12 Automatic Transmission Assembly
  18. Disconnect the electrical connector: Q77 Transmission Control Solenoid Valve
  19. Test for less than 2 ohms between the test points: Control circuit terminal 49 &
    • { P0960, P0962, P0963 } Terminal 1 @ Q77A Transmission Control Solenoid Valve 1
    • { P0964, P0966, P0967 } Terminal 1 @ Q77B Transmission Control Solenoid Valve 2
    • { P0968, P0970, P0971 } Terminal 1 @ Q77C Transmission Control Solenoid Valve 3
    • { P2718, P2720, P2721 } Terminal 1 @ Q77D Transmission Control Solenoid Valve 4
    • { P2812, P2814, P2815 } Terminal 1 @ Q77G Transmission Control Solenoid Valve 7
    • { P281B, P281D, P281E } Terminal 1@ Q77H Transmission Control Solenoid Valve 8
    • If 2 ohms or greater 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If less than 2 ohms 
  20. 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 
  21. 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 19
    • { P0964, P0966, P0967 } Terminal 2 @ Q77B Transmission Control Solenoid Valve 2 - Electrical Connector & Control circuit terminal 3
    • { P0968, P0970, P0971 } Terminal 2 @ Q77C Transmission Control Solenoid Valve 3 - Electrical Connector & Control circuit terminal 20
    • { P2718, P2720, P2721 } Terminal 2 @ Q77D Transmission Control Solenoid Valve 4 - Electrical Connector & Control circuit terminal 4
    • { P2812, P2814, P2815 } Terminal 2 @ Q77G Transmission Control Solenoid Valve 7 - Electrical Connector & Control circuit terminal 18
    • { P281B, P281D, P281E } Terminal 2 @ Q77H Transmission Control Solenoid Valve 8 - Electrical Connector & Control circuit terminal 2
    • If 2 ohms or greater 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If less than 2 ohms 
  22. Test for infinite resistance between the test points: Ground &
    • { P0960, P0962, P0963 } Terminal 2 @ Q77A Transmission Control Solenoid Valve 1 - Electrical Connector
    • { P0964, P0966, P0967 } Terminal 2 @ Q77B Transmission Control Solenoid Valve 2 - Electrical Connector
    • { P0968, P0970, P0971 } Terminal 2 @ Q77C Transmission Control Solenoid Valve 3 - Electrical Connector
    • { P2718, P2720, P2721 } Terminal 2 @ Q77D Transmission Control Solenoid Valve 4 - Electrical Connector
    • { P2812, P2814, P2815 } Terminal 2 @ Q77G Transmission Control Solenoid Valve 7 - Electrical Connector
    • { P281B, P281D, P281E } Terminal 2 @ Q77H Transmission Control Solenoid Valve 8 - Electrical Connector
    • If less than infinite resistance 

      Replace the component: Automatic Transmission Wiring Harness

    • Go to next step: If infinite resistance 
  23. Test for infinite resistance between the test points: Control circuit terminal 49 &
    • { P0960, P0962, P0963 } Control circuit terminal 19
    • { P0964, P0966, P0967 } Control circuit terminal 3
    • { P0968, P0970, P0971 } Control circuit terminal 20
    • { P2718, P2720, P2721 } Control circuit terminal 4
    • { P2812, P2814, P2815 } Control circuit terminal 18
    • { P281B, P281D, P281E } Control circuit terminal 2
    • If less than infinite resistance 

      Replace the component: Automatic Transmission Wiring Harness

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