Solenoid block pack plus 4WD filter, spin-on filter and pan gasket for 45RFE and 545RFE in 2002-2012 Ram and 1999-2013 Grand Cherokee.
If your Ram 1500, Ram 2500, Grand Cherokee or Aspen with the 45RFE or 545RFE has gone into limp mode, is holding one gear with the check engine light on, or is throwing solenoid circuit codes in the P0750 to P0770 range, this is the part most people end up searching for. This kit is a replacement solenoid block for the 45RFE and 545RFE, packed with the parts you need to close the job up: a 4WD-style primary filter, the spin-on cooler return filter and a pan gasket. The listing crosses it to 52119435AF, 5170877AF, 68002342AD, 4799937AD and 05179267AC, with a black harness plug.
These transmissions have no governor and no throttle valve. The computer applies every clutch directly by firing solenoids, and the solenoid block is where all of them live. Chrysler's service information lists six shift solenoids (low/reverse, 2nd clutch, overdrive, underdrive, 4th clutch and multi-select) plus a pressure control solenoid that sets line pressure. The same assembly carries five pressure switches that report back whether each clutch actually applied, and Chrysler builds the range sensor into it as well, which is why the factory name is the Transmission Solenoid/TRS Assembly. One bad coil, one leaking switch or one corroded pin in the 23-pin connector is enough to make the whole transmission misbehave.
When the computer sees a fault it cannot live with, it cuts power to the solenoids. The underdrive and multi-select solenoids are normally applied, so the truck stays in third in Drive and second in manual 1 or 2. That is the classic RFE limp mode.
Check the TCM power feed first. Several codes at once usually mean the common supply is weak, not that several solenoids died together, and a shorted pack can pull that feed down and set P0882. With the 23-pin connector unplugged, meter from pin 10 to each control pin; Sonnax lists about 1.3 ohms for the shift solenoids and 3.5 ohms for the pressure control solenoid. A reading near zero is a shorted coil. Chrysler states that a P0750-type circuit code is strictly electrical and that the valve body should not be replaced for it. Pressure switch rationality codes such as P0871 are different: they are often hydraulic, so rule out low fluid and internal leaks first. Our 45RFE shift solenoid testing guide walks through every step, and the pressure control solenoid guide covers line pressure codes.
The listing covers the 45RFE and 545RFE in the Dodge Ram 1500 2002-2010, Ram 2500/3500 2002-2012, Jeep Grand Cherokee 1999-2013 and Chrysler Aspen 2007-2009. That is a long run, and Chrysler changed the pack during it. Sonnax's solenoid history shows the white-connector six-solenoid pack ran 2000 to 2009, while the 2010 gray-connector pack dropped the overdrive solenoid and will not back-service earlier units. This kit is listed with a black plug, so pull your old pack and compare the plug color and the part number stamped on it with the cross references above before you order. If they do not line up, send us the year, model and VIN and we will check it. Every part we carry for this family is on the 45RFE and 545RFE parts page.
If you have P1775 or P1776 (solenoid switch valve latched) with no circuit code, the pack is rarely the fix. That points at a worn valve bore, and a 45RFE valve body for 1999-2009 is the usual answer. See 45RFE valve body problems for the vacuum test.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Those years are in the listed fitment, but Chrysler moved to a gray-connector five-solenoid pack around 2010 that cannot back-service earlier units. Compare the plug color and the part number on your old pack with the cross references on this page, or send us your VIN before ordering.
The solenoid block pack, a 4WD-style primary filter, the spin-on cooler return filter and a pan gasket, so the pack, both filters and the pan seal are all done in one pan drop.
Possibly, but third gear is the failsafe for any serious fault, not just a solenoid. Read the stored codes. Circuit codes P0750-P0770 or P2706 point at the pack or its wiring; pressure switch, ratio or line pressure codes need more testing first.
ATF+4 only. Check the level hot after the fill, because the 45RFE and 545RFE are sensitive to being overfilled or underfilled.
Yes. Chrysler requires a Quick Learn after solenoid pack replacement. Without it the computer keeps the learned values for the old pack and you will likely get harsh or flared shifts.
