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Home >> Chevrolet >> 2016 >> Volt Premier >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission - 5ET50 (MKV) >> Diagnostic Information and Procedures >> DTC P0964, P0966-P0968, P0970, P0971, P2718, P2720, P2721, P2727, P2729, or P2730: Transmission Control Solenoid Valve 2 Control Circuit/Transmission Control Solenoid Valve 3 Control Circuit/Transmission Control Solenoid Valve 4 Control Circuit/Transmission Control Solenoid Valve 5 Control Circuit >> Circuit/System Testing
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Circuit/System Testing

WARNING:

Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure includes the following steps:

  • Identify how to disable high voltage.
  • Identify how to test for the presence of high voltage.
  • Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.

Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:

  • Safety glasses with appropriate side shields when within 15 meters (50 feet) of the vehicle, either indoors or outdoors.
  • Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
    • Visually and functionally inspect the gloves before use.
    • Wear the Insulation gloves with leather protectors at all times when working with the high voltage battery assembly, whether the system is energized or not.

Failure to follow the procedures may result in serious injury or death.

  1. Vehicle OFF, disable the high voltage at the T6 Power Inverter Module. Refer to High Voltage Disabling .
  2. Remove the Control Valve Body Cover, refer to Control Valve Body Cover Replacement .
  3. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the Q8 Control Solenoid Valve Assembly.
  4. Connect the 12 V battery.
  5. Ignition ON, connect a test lamp between the control circuit terminal and the ground circuit terminals listed below:
    • Solenoid valve 2, high side driver circuit terminal 1 to control circuit terminal 2
    • Solenoid valve 3, high side driver circuit terminal 7 to control circuit terminal 8
    • Solenoid valve 4, high side driver circuit terminal 7 to control circuit terminal 6
    • Solenoid valve 5, high side driver circuit terminal 7 to control circuit terminal 5
  6. Verify the test lamp turns ON and OFF when commanding the Pressure Control Solenoid Valve On and Off with a scan tool for each corresponding solenoid.
    • If the test lamp is always OFF 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the T6 Power Inverter Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, replace the Automatic Transmission Wiring Harness - Control Solenoid Valve.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, replace the Automatic Transmission Wiring Harness - Control Solenoid Valve.
      • If less than 2 Ω, replace the T6 Power Inverter Module.
    • If the test lamp is always ON 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the T6 Power Inverter Module, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the T6 Power Inverter Module.
    • If the test lamp turns ON and OFF 
  7. Replace the Q8 Control Solenoid Valve.
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