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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0658, P0659, P2718, P2720, P2721, P2727, P2729, P2730, P281B, P281D, or P281E >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

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

Circuit Description
Control - Terminal 1 @ X175 The output circuit is switched to ground to activate the component. This is a normally closed valve that is controlled on/off.
Control - Terminal 13, 14 @ X175 The output circuit is switched to ground to activate the component. The output is PWM controlled.
Control - Terminal 18 @ X175 The output circuit is switched to 12 V to enable the component(s).
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.
Q77 Transmission Control Solenoid Valve A solenoid valve is an electro-mechanically operated valve. The valve is controlled by an electric current through the solenoid.
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