Remanufactured, tested solenoid block for 2010-2018 Ram 68RFE, 545RFE and 45RFE units with the gray pass-through connector. Cures limp mode.
If your Ram 2500 or 3500 Cummins with the 68RFE has started out in second gear, stopped upshifting, or thrown a solenoid or line pressure code with the check engine light, the solenoid block pack bolted to the valve body is the first assembly to look at. This listing is a remanufactured, tested block pack for the gray-connector design that Chrysler used from 2010 through 2018. It also serves the 545RFE and 45RFE where the transmission came with the same gray plug, in trucks and SUVs such as the Ram 1500, Durango, Grand Cherokee and Aspen. The listing describes it as the shift solenoids together with the line pressure transducer in one block.
The RFE family has no hydraulic shift valves deciding when to shift. The transmission computer applies each clutch directly by switching solenoids in this pack, and a variable force pressure control solenoid sets line pressure against the reading from the line pressure sensor in a closed loop. Pressure switches in the pack report back that each clutch circuit actually came up to pressure. Everything passes through one 23-pin case connector. The gray pack is the simplified version: Sonnax notes that by 2010 Chrysler found one of the six shift solenoids, the overdrive solenoid, was no longer needed, so the gray pack carries five shift solenoids plus the pressure control solenoid, and pin 7 of the connector is unused. The multi-select solenoid took over the job the overdrive solenoid used to do.
Chrysler's service information treats a solenoid circuit code like P0750 as strictly electrical: an open or short in the wiring, the connector, the controller or the solenoid assembly. So unplug the case connector, check the pins for corrosion or fluid wicking, and measure the coils. Sonnax lists the shift solenoids at about 1.3 ohms and the pressure control solenoid at about 3.5 ohms. Line pressure and pressure switch codes are different: low fluid, a weak pump or an internal leak can set them on a healthy pack. Our 68RFE limp mode causes guide sorts out electrical from hydraulic faults, and the RFE pressure control solenoid guide explains how to compare desired and actual line pressure on a scan tool.
This block pack is for RFE transmissions built 2010 through 2018 with the gray case connector, including 68RFE Ram 2500/3500 pickups and 4500/5500 chassis cabs. It does not fit the earlier black-connector (1999) or white-connector (2000-2009) units, because the gray pack is designed for five shift solenoids and Sonnax states it cannot back-service the six-solenoid packs. It also does not fit 2019 and later trucks, which moved to a blue connector, reinstated a sixth solenoid as a reverse solenoid and added a separate converter clutch solenoid. Drop the pan and look at the connector color on your old pack before ordering, or send us the year and VIN. The 68RFE identification guide helps confirm which unit you have, and the full parts range is on the 68RFE parts page.
If the fluid comes out dark with friction material in the pan, the clutches have already been slipping and a new pack alone will not restore the shifts. In that case price a RFE master rebuild kit before you order.
| Part type | Shift solenoid block pack (solenoids + line pressure transducer) |
| Condition | Remanufactured, fully tested |
| Connector | Gray (2010-2018 design) |
| Primary fit | Chrysler/Ram 68RFE |
| Also fits | 45RFE, 545RFE with gray connector |
| Vehicles | Ram 1500/2500/3500/4500/5500, Dodge Durango, Jeep Grand Cherokee, Chrysler Aspen (gray connector models) |
| Warranty | 1 year (manufacturer) |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The gray pack is built for the five-solenoid 2010-2018 design and cannot back-service the earlier six-solenoid white-connector units. A 2007-2009 truck needs a white-connector pack.
No. 2019 and later units use a blue connector, a sixth solenoid that works as a reverse solenoid, and a separate converter clutch solenoid on the other side of the valve body.
Yes, when the 545RFE has the gray case connector, as in 2010-2018 Ram 1500, Durango, Grand Cherokee and similar gray-plug applications. Check the plug color on your old pack before ordering.
No. Drop the pan, remove the filter and unplug the internal connector, then unbolt the pack from the valve body.
Yes. Run the Quick Learn after installing a new solenoid pack so the controller relearns clutch fill volumes. Without it shifts can be harsh or soft until it adapts.
ATF+4. The RFE transmissions are specified for ATF+4; check the level with the fluid at operating temperature.
