66RFE Pressure Control Solenoid, remanufactured and ready to install. Fits the 66RFE. Ships fast from the USA.
Searching for a 66RFE pressure control solenoid usually starts with a Ram 2500, Power Wagon or cab-chassis truck that has started slamming into gear, slipping on the 2-3, or setting a line pressure code. The line pressure solenoid on this transmission family is an integral part of the solenoid and pressure switch assembly, so it is replaced as a complete pack. This listing is a remanufactured Mopar pack with the white 23-pin pass-through connector, as the photo shows. The listing gives no year range, so read the fitment section before ordering.
Every RFE shift is electronic, with no shift valves and no hydraulic governor. The controller sets a target line pressure from calculated input torque and reads the line pressure sensor to check the result. The variable force solenoid in this pack moves the pump pressure regulator valve to get there: commanding more duty cycle lowers pressure, and an unpowered solenoid sends pressure to maximum. The rest of the pack applies the individual clutches and reports back through pressure switches, so one assembly controls both how hard the clutches clamp and which clutch is on.
The white pack is the six-solenoid design. Sonnax calls it very reliable and notes it was built from 2000 through 2009, when Chrysler moved to the five-solenoid gray pack and dropped the overdrive solenoid.
Check fluid level and filter installation before anything else, since a loose or wrong primary filter is on the factory cause list for low pressure. Then compare desired and actual line pressure on a scan tool, measure the solenoid resistance at the pack, and confirm the reading with a mechanical gauge. If the coil and circuit are good and pressure is still off, the pump regulator or valve body is the next stop, not this part. Our 66RFE pressure control solenoid guide has the full test sequence and readings, and the RFE valve body testing guide covers the hydraulic side.
This part is listed for the 66RFE without years, so match it to your truck before you buy. GEARS Magazine lists the 66RFE in Ram 2500, Power Wagon and chassis cab models. Look at the connector on the pack you have now. If it is white, this is a like-for-like swap. If it is gray, Sonnax reports that dealers did service 2009-and-later units with the white pack when the gray pack was back-ordered, but the reverse never works: a five-solenoid gray pack cannot go into a unit built for six. Trucks from 2019 on use a blue-connector pack and a different gasket, so this part does not fit them. For a gray-connector replacement, see the 66RFE pack for 2010-2018, or send us your year and VIN. The full range is on the 66RFE parts page.
| Fits | 66RFE |
| Part type | Pressure Control Solenoid |
| Condition | Remanufactured |
| Brand | Mopar |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
On the RFE transmissions the line pressure variable force solenoid is integral to the solenoid and pressure switch assembly. There is no separate service solenoid, so the pack is the replacement part.
Sonnax reports dealers used white packs to service 2009-and-later units when gray packs were back-ordered. A gray pack cannot go the other way into a six-solenoid unit. Send your year and VIN and we will confirm the match for your truck.
No. 2019-up units use the blue-connector pack with a reverse clutch solenoid and a different gasket.
A new white/gray style silicone-beaded solenoid gasket, a new filter, and ATF+4 checked at operating temperature.
Yes. A worn pump pressure regulator bore, a faulty line pressure sensor connection, or an aftermarket tune can all mimic it. Confirm with scan data, a coil resistance check and a mechanical gauge before buying.
