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Home >> GMC >> 2024 >> Terrain SLT, FWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 9T45 (M3U) Or 9T50 (M3D M3H) - Diagnostic Information And Procedures (2 Of 2) >> Diagnostic Information and Procedures >> DTC P18A2 or P18A4 >> Circuit/System Description

Circuit/System Description

Circuit Description
Control - Terminal 28 The output circuit is switched to 12 V to activate the component.
Control - Terminal 10 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.
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 M123 Transmission Park Valve Lock Solenoid Actuator/Transmission Control Solenoid Valve 11 is energized, it prevents the transmission from going into park, by holding the Park Release Servo Pistonin the extended position.