5R55E Pressure Control Solenoid, new and ready to install. Fits the 5R55E. Ships fast from the USA.
A 5R55E Ranger, Mazda B4000 or early Explorer that thumps hard into Drive, feels mushy on the 2-3 shift, or keeps logging an EPC code usually gets this part tested first. This is a new electronic pressure control (EPC) solenoid made by Rostra under part number 52-0438, built to replace Ford XL2Z-7G383-AA. Rostra lists it for 1997 through 2008 with an inductive signal design, a 4.5 ohm coil and two red inlet screens on the nose. It mounts on the valve body, so the job is done through the pan opening with the transmission still in the truck.
Line pressure in the 5R55E is set by the PCM, not by a throttle cable or vacuum modulator. The computer weighs throttle angle, engine load and speed, then varies current to the EPC solenoid. The solenoid turns that current into a signal pressure that acts on the boost valve, and the boost valve leans on the main pressure regulator to raise or lower mainline oil. Every clutch and both band servos in this five-speed apply from that mainline, so one small solenoid sets engagement feel, shift firmness and how hard the intermediate and overdrive bands grip under load. The circuit is designed to default high: if the PCM loses control of the solenoid, pressure goes up to protect the clutches, which is why an electrical fault normally shows up as harsh shifting rather than slipping.
Check fluid level and smell first, then pull codes and note whether they point to an electrical circuit fault or a performance fault. Unplug the transmission case connector and look for ATF wicking into the pins or green corrosion. Measure the EPC circuit and compare it with the 4.5 ohm rating of this solenoid; an open circuit or a reading far off that figure condemns the coil or harness. The most useful test is a pressure gauge on the line tap while a scan tool steps the EPC command up and down. If gauge pressure follows the command, the solenoid is doing its job and the problem is hydraulic. Sonnax ties low line rise, soft shifts and delayed reverse in this valve body to worn boost valve and pressure regulator bores, so a good solenoid in a worn bore can still shift poorly. Our 5R55 harsh or delayed shift walkthrough lays out the test order.
Rostra catalogs this solenoid for the Ford 5R55E from 1997 through 2008 as the replacement for XL2Z-7G383-AA. The 5R55E is the five-speed from the 4R44E family used in Rangers, Mazda B-Series trucks and 1997-2001 Explorer and Mountaineer models with the 4.0L; it is not the same transmission as the 2002-later 5R55W or 5R55S, which use a different solenoid pack. Not sure which unit you have? Our 5R55 identification guide explains how to tell the E apart from the W, N and S. Match the bracket shape, two-blade connector and screen layout against your old solenoid, or send us your year and VIN before ordering. Other 5R55E parts are on the 5R55 parts page.
If the truck has also set shift solenoid codes, the 5R55E solenoid kit replaces the rest of the electrical set in one pan drop, and the Sonnax Zip Kit addresses the worn regulator bores that make a new solenoid look bad.
| Fits | 5R55E |
| Part type | Pressure Control Solenoid |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Only if it has a 5R55E, and 2002-later Explorers do not. The redesigned 2002-up Explorer and Mountaineer use the 5R55W or 5R55S, which have a different solenoid body. This solenoid is for the 5R55E used in Rangers, Mazda B-Series trucks and 1997-2001 Explorers with the 4.0L.
P0748 is the common electrical code for the pressure control solenoid circuit. A solenoid that sticks mechanically may set no code at all and only cause harsh or soft shifts, which is why a line pressure gauge test matters.
This Rostra 52-0438 solenoid is rated at 4.5 ohms. Measure your old one and compare. A reading far from that number or an open circuit points at the solenoid or its wiring.
No. The EPC solenoid is mounted on the valve body and is reached by dropping the pan and filter. Replace the O-rings, refill with Mercon V and check the level hot.
At minimum a filter and pan gasket. If you also have shift solenoid codes, replacing the full solenoid set at the same time saves a second pan drop. If line pressure stays low with a good solenoid, the boost valve and pressure regulator bores are the next suspects.
