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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 10L80 (MHS MHU MQC) - Diagnostic Information And Procedures (2 Of 2) >> Diagnostic Information and Procedures >> DTC P18A2-P18A4 >> Circuit/System Description

Circuit/System Description

Circuit Description
Control - Terminal 11 The output circuit is switched to 12 V to enable the component(s).
Control - Terminal 12 The output circuit is switched to ground to activate the component.
Component Description
K71 Transmission Control Module The control module contains a microprocessor used to process input data to control outputs.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.
M123 Transmission Park Valve Lock Solenoid Actuator A linear solenoid actuator is an electro-mechanical device that converts electrical power into a mechanical pushing or pulling force or motion.

When the component is commanded on, the park servo valve is held in the out of park position, preventing the transmission from going into park.