5R55E Pressure Control Solenoid 1997

Most people who land here searched for a 5R55E pressure control solenoid because a Ranger, Explorer, Explorer Sport or Mazda B4000 has gone soft on the upshifts, is slow to pick up Reverse, or has set a pressure control code. Before you order, know what this listing actually is. It is not a loose solenoid. It is a complete remanufactured 5R55E/5R44E valve body for 1997-up units with the solenoids, including the EPC pressure control solenoid, already installed. A separator plate and new gaskets come with it, and each unit is tested on a valve body test stand before it ships. If your EPC coil checked bad and the bores are tired too, this takes care of both in one job.

What the pressure control solenoid does in a 5R55E

The 5R55E is the five-speed the Ranger and early Explorer received for 1997, and its valve body belongs to the same family as the 4R44E, 4R55E and 5R44E. The PCM sets line pressure through the EPC (electronic pressure control) solenoid. EPC output acts on the boost valve, and the boost valve tells the main pressure regulator valve how much line pressure to hold. More EPC signal gives firmer clutch and band apply; less gives softer apply. The catch is that the solenoid is only the messenger. If the boost valve or regulator bore is worn, oil leaks past the valve and the pressure the PCM asked for never reaches the clutches, no matter how good the solenoid is. That is why this assembly is a better fix than a coil alone on a high-mileage unit.

What was updated in this valve body

• Updated pressure regulator valve, the valve that holds base line pressure
• Updated boost valve, the valve the EPC signal works through
• Updated TCC regulator valve for converter clutch apply
• Other updates made as needed during the rebuild, with solenoids, separator plate and new gaskets included

Symptoms that point to EPC and valve body wear

• Soft shifts across the board, or a flare on the 2-3 or 3-4 upshift
• Delayed Reverse, sometimes with a burnt Reverse band found on teardown
• Delayed forward engagement or second-gear starts
• Converter clutch slip with code P0741
• Pressure control solenoid code P0748, or harsh engagement when pressure runs high
• Overheating or low cooler flow at idle from a worn pressure regulator

How to confirm before you buy

Start with the cheap checks. Read the codes, measure EPC solenoid resistance at the case connector, and look for ATF wicked into the connector. Then put a pressure gauge on the line tap and compare idle pressure with pressure when the PCM commands a rise. A solenoid that measures good combined with flat line rise points to a leaking boost valve or regulator bore, which is exactly what a rebuilt valve body corrects. A slip on only the intermediate or overdrive shift with P0735 can be servo bore wear instead, and a valve body will not cure that. Our 5R55 harsh or delayed shifts walkthrough separates those cases step by step.

Fitment

This valve body is built for the 5R55E and 5R44E from 1997 up. The 5R55E ran from 1997 through 2011 in the Ranger, Explorer, Explorer Sport and Mazda B4000. It does not fit the 5R55W or 5R55S used in the 2002-and-later four-door Explorer, Mountaineer, Mustang and Lincoln LS, which have a different valve body and an integrated solenoid pack. Calibrations changed over a long production run, so compare your transmission ID tag and the solenoid layout on your old valve body with the listing photo, or send your year and VIN before ordering. Not sure which 5R55 you have? The 5R55 identification guide covers the E, N, W and S. Everything else for this family is on the 5R55 parts page.

Install notes

• Drain the fluid, drop the pan and filter, unplug the harness and remove the old valve body. Note the checkball positions before you lift the plate.
• Install the supplied separator plate and gaskets. Do not reuse the old plate.
• Start the bolts by hand, then torque them in sequence to factory spec with an inch-pound wrench. Uneven clamping can bind a valve that tested fine on the stand.
• Fit a new filter and pan gasket, refill with Mercon V, and check the level hot.
• Clear the codes and reset the PCM adaptive memory, then road test through all five gears.
• A worn pump bushing bleeds off the same pressure, so inspect the front pump while the unit is open. The 5R55E pump for 1997 is listed separately, and if the transmission needs more than a valve body, the 5R55E master rebuild kit covers the soft parts.

Is this only the pressure control solenoid?

No. It is a complete remanufactured 5R55E/5R44E valve body with the EPC and shift solenoids already installed, plus a separator plate and new gaskets. It replaces the solenoid and the worn valve bores in one job.

Will it fit my 4.0L Ranger?

If the ID tag on your transmission says 5R55E, this valve body is built for it from 1997 up. Calibrations changed over the years, so send your year and VIN if you want us to confirm before ordering.

Does it fit a 2004 four-door Explorer?

No. The 2002-and-later four-door Explorer and Mountaineer use the 5R55W or 5R55S, which have a different valve body and a one-piece solenoid pack.

What fluid does the 5R55E take?

Mercon V. Install a new filter and pan gasket with the valve body and set the level with the fluid at operating temperature.

Do I need to do a relearn after installing it?

Yes. Clear the codes and reset the PCM adaptive memory, then drive through every gear with several light and moderate throttle shifts so the computer relearns shift pressure.

Will a new valve body fix slipping in fifth with code P0735?

Only if valve body leakage is the cause. Servo bore wear produces the same complaint on this family, and it has to be repaired in the case. Check it before you replace the valve body.

• 5R55 Harsh or Delayed Shifts: A Diagnostic Walkthrough
• 5R55S Identification Guide: 5R55S vs W, N and E