5R55S Solenoid Kit, new and ready to install. Fits the 5R55S. Ships fast from the USA.
Before you pay for a new solenoid block on a 5R55S or 5R55W, look at the connector that plugs into it. This kit is a new external connector pigtail for the 5R55S, 5R55W and 5R55N solenoid pack. It is not the solenoid block itself. It replaces the bolt-in plug on the side of the case that carries every solenoid circuit from the vehicle harness. Explorer, Mountaineer, Mustang V6 and Lincoln LS owners need it when the old plug is cracked, melted, corroded or full of oil and the truck keeps going into limp mode with a different solenoid code each time. The kit contains a new bolt-in connector with roughly 8 to 10 inches of wire leads, a packet of heat-shrink butt connectors, and an instruction sheet.
Every solenoid in these transmissions lives in one solenoid body: four on/off shift solenoids, a pulse width modulated converter clutch solenoid, and three variable force solenoids that set line pressure and engagement feel. All of them are fed through one multi-pin connector that bolts to the solenoid body through the side of the case and is held by a single center bolt. Ford's service procedure fits two new O-rings to the solenoid body connector and requires the harness connector to be fully seated before the bolt is tightened. When the plug's shell cracks, its pins corrode, or fluid wicks past those O-rings into the wiring, the computer sees open or shorted circuits on solenoids that are actually fine.
Unbolt the connector and inspect both halves. Fluid, burnt pins or broken locking tabs point to the connector. Next, wiggle-test the harness with a scan tool connected and watch for solenoid faults that set or clear as you move the wires. If the connector is clean and the faults stay put, measure the solenoids through the transmission side of the connector. An out-of-range reading there means the block itself, and the updated 9L2Z-7G391-AA solenoid block is the fix. Our 5R55S shift solenoid symptoms guide and 5R55S limp mode guide walk through the rest of the checks.
The kit is made for the external solenoid pack connector on the 5R55W and 5R55S, the transmissions used in 2002-up four-door Explorers and Mountaineers, the Aviator, the 2005-2010 Mustang V6 and 4.6L, and the Lincoln LS. It is also listed for the 5R55N. It does not fit the 5R55E in the Ranger and Explorer Sport Trac, which uses separate solenoids with an internal harness. Compare the shape of your old plug with the photo before ordering, or send us your year and VIN. The 5R55 identification guide explains how to tell an N, W or S from an E, and the 5R55 collection has the rest of the parts for these units.
| Fits | 5R55S |
| Part type | Solenoid Kit |
| 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.
No. This is the external connector pigtail that plugs into the solenoid pack. It includes a new bolt-in connector with wire leads, butt connectors and instructions. If the solenoids themselves are bad, you need a solenoid block, which we also carry.
If the connector is cracked, corroded or full of fluid, or if codes change when you wiggle the harness, start with the connector. If the connector is clean and solenoid resistance is out of range when measured on the transmission side, replace the block.
No. The connector is on the outside of the case and is held by one center bolt. You splice the new leads into the vehicle harness, so the transmission does not have to be opened.
It is made for the 5R55S and 5R55W used in 2002-up four-door Explorers. Compare your old plug with the photo, or send us your VIN and we will confirm it.
No. The 5R55E in the Ranger, Sport Trac and B-series uses separate solenoids with an internal harness and a different case connector.
