66RFE Pressure Control Solenoid 2010-2018, remanufactured and ready to install. Fits the 66RFE. Ships fast from the USA.
If your heavy-duty gas Ram with a 66RFE is banging into Drive, sliding through upshifts, or has set P0869, P0933 or P0868, the part doing the pressure control is probably what you are shopping for. On the RFE family the line pressure control solenoid is not a separate plug-in part. It is built into the solenoid and pressure switch assembly, so the repair is the complete pack. That is what this listing is: a remanufactured 2010-2018 style pack with the gray 23-pin pass-through connector, shown in the photo with its connector seal in place.
The 66RFE has no throttle cable or modulator. The controller works out how much torque is coming into the transmission and asks for a line pressure to match, then reads a separate line pressure sensor to see what it actually got. The pressure control solenoid, which Sonnax labels LP VFS on pin 12 of the pack connector, is the part that makes the change. It sends oil to the end of the pressure regulator valve in the pump. More duty cycle means more oil on that valve and lower line pressure; with the solenoid off, line pressure goes to maximum. That is a deliberate fail-safe: a dead coil clamps the clutches hard instead of letting them slip.
The same pack also carries the clutch solenoids and five pressure switches that confirm each clutch actually filled. On the gray pack generation Chrysler deleted the overdrive solenoid and let the multi-select solenoid take over its job, which is why this pack has five solenoids where the earlier white pack has six.
Look at the scan data before you pull the pan. With the engine running, desired and actual line pressure should track each other and move with gear and throttle. Sonnax documents the classic open-circuit capture: actual pressure parked near 160 psi, desired stuck at a default value, and the duty cycle doing nothing. Then ohm the solenoid at the pack. An open reading means the pack, while a good coil with no current on the control wire means wiring or the controller. If the circuit and coil are good but pressure is still low, check the pump and regulator before spending money here. Our 66RFE pressure control solenoid testing guide walks through each step, and the RFE P0871 pressure switch guide covers switch codes on the same pack.
This pack is listed for the 66RFE from 2010 through 2018. GEARS Magazine places the 66RFE in the Ram 2500, Power Wagon and chassis cab trucks. The easy check is the connector on your existing pack: it should be gray. Sonnax notes a gray pack cannot back-service a pre-2010 unit because the earlier valve body expects six solenoids, and 2019-up trucks use a blue-connector pack with a reverse clutch solenoid and a separate converter clutch solenoid, so neither of those is a match for this part. If you are unsure, send your year and VIN before ordering. Every other part we carry for this unit is on the 66RFE parts page, and if your truck came with the earlier white-connector pack, see the 66RFE pack with the white connector.
| Fits | 66RFE 2010-2018 |
| Part type | Pressure Control Solenoid |
| Condition | Remanufactured |
| 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. On the RFE family the line pressure control solenoid is built into the solenoid and pressure switch assembly, so a failed control solenoid is repaired by replacing the whole pack, which is what this listing is.
No. 2019-up RFE units use a blue-connector pack with an added reverse clutch solenoid and a separate converter clutch solenoid. This is the gray-connector pack for 2010-2018 trucks.
P0933 points at the line pressure sensor by name, but Sonnax shows that an open pressure control solenoid circuit commonly sets it. If there is no P0934 or P0935 and actual pressure sits flat near 160 psi, check the solenoid circuit first.
ATF+4 only, with the level checked at operating temperature. Fill the pan back up before you start the quick learn.
Yes. Clear codes and run the quick learn with a capable scan tool, then drive through a number of full shift cycles so the controller adapts to the new solenoids.
