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Home >> GMC >> 2024 >> Terrain SLT, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Automatic Transmission - 6T40 (MNH) - 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 2024 Chevrolet Equinox. 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.