Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Line Pressure Control (LPC) Solenoid
The LPC solenoid is a Variable Force Solenoid (VFS) that varies hydraulic pressure by actuating a hydraulic valve.
The PCM applies variable current to the LPC solenoid which varies pressure in the VBS LINE hydraulic circuit to the main pressure regulator valve. Refer to HYDRAULIC CIRCUITS for additional information.
The LPC solenoid uses inversely proportional operation. As the current from the PCM decreases, the pressure from the solenoid increases. As the current from the PCM increases, the pressure from the solenoid decreases. The LPC solenoid is supplied hydraulic pressure from the SOL FD circuit.
With zero current, the LPC solenoid fully opens the hydraulic valve which applies the maximum amount of hydraulic pressure to the Main Pressure Regulator Valve through the VBS LINE hydraulic circuit and applies maximum line pressure in the LINE hydraulic circuit. With maximum current to the solenoid, the hydraulic valve fully closes the outlet port for minimum pressure to the VBS LINE hydraulic circuit to lower the line pressure in the LINE hydraulic circuit.
Line Pressure Control (LPC) Inversely Proportional Variable Force Solenoid (VFS)
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.