How to Replace a Pressure Control Solenoid Valve in a Transmission

by Ryan Hotchkiss
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Transmission power control solenoid -- PCS -- valves are duty cycle-controlled components that manage the pressure of transmission fluid. A PCS is required to prevent the transmission from seizing up from lack of fluid or bogging down as a result of too much fluid. The PCS is found on the body of the transmission. Removing and replacing it is not difficult. However, locating and identifying the PCS is not a simple task, as there are several other solenoids in the same general area.

Step 1

Disconnect the battery. Remove the negative terminal with a socket set and wrench first, then remove the positive cable. Standing over the engine bay, remove the dipstick from the transmission. Slide under the vehicle with your tools. Place the oil pan under the transmission. Unscrew the fluid plug on the bottom of the transmission to drain the oil into the pan.

Step 2

Pull the oil pan from the bottom of the transmission. This requires you remove 20 bolts or so with a socket wrench. Put the bolts in the oil pan so you do not sully them with dirt by laying them on the ground. The transmission fluid will keep them lubricated and clean. Peel the gasket off the rim of the transmission fluid pan or the rim of the transmission; it sticks to one or the other.

Step 3

Unthread the bolts or screws on the fix plate and remove it. Look in the vehicle owner's manual for the transmission parts diagram. Identify the PCS. Pull the two wires off the PCS and pull it off the fix plate. The PCS is fastened to the fix plate with tabs that you must depress before pulling it off, or with small screws you must first unthread.

Step 4

Affix the new PCS and hook up the two wires on the proper terminal tabs. Screw the fix plate back in position. Run transmission fluid on the new gasket and put it around the rim of the oil pan. Put the oil pan in position under the transmission and bolt it into place. Refill the transmission with fluid. The owner's manual specifies the proper amount.

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