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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Automatic Transmission - 6T45 (MH7) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0658 or P0659 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to:Electronic Component Description

Circuit Description
Control The output circuit is switched to 12 V to activate the component.
Component Description
K71 Transmission Control Module The control module receives information from a variety of sensors, switches and serial data information from other control modules. This information is used to control a combination of solenoid valves to obtain the correct line pressure, gear ratio and torque converter clutch operation.
K71 is part of the component: Q8 Control Solenoid Valve Assembly
  • Q27A Pressure Control Solenoid Valve 1
  • Q27B Pressure Control Solenoid Valve 2
  • Q27C Pressure Control Solenoid Valve 3
  • Q27D Pressure Control Solenoid Valve 4
  • Q27E Pressure Control Solenoid Valve 5
  • Q32A Shift Solenoid Valve 1
  • Q39A Torque Converter Clutch Pressure Control Solenoid Valve
 A solenoid valve is an electro-mechanically operated valve. The valve is controlled by an electric current through the solenoid.
Q27A, Q27B, Q27C, Q27D, Q227E, Q32A, Q39A is part of the component: Q8 Control Solenoid Valve Assembly

No external circuit diagnosis is involved.

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