45RFE Pressure Control Solenoid 2004, remanufactured and ready to install. Fits the 45RFE. Ships fast from the USA.
A 2004 Dodge Ram 1500, Dakota, Durango, Jeep Grand Cherokee or Liberty with the 45RFE that slams into gear, slips on the 2-3 shift, or sets a line pressure code such as P0868 or P0869 is usually pointing at the pressure control side of the transmission. This is a remanufactured Mopar pressure control solenoid assembly for the 2004 45RFE. On this transmission the pressure control solenoid is not a loose plug-in coil; Chrysler builds it into the solenoid and pressure switch assembly that bolts to the side of the valve body, and that complete assembly is what is pictured and what you receive.
The 45RFE has no throttle valve cable and no governor. Line pressure is set electronically in a closed loop: the transmission computer reads a line pressure sensor, compares it with the pressure it wants for the current engine torque, and adjusts the duty cycle of the pressure control solenoid until the two agree. The regulator valve spring is set to give high pressure, and the solenoid works against it to bring pressure down. Chrysler's service data shows the logic is inverted, with about 5 percent duty giving maximum pressure and about 62 percent giving minimum. That means a solenoid that loses its circuit drives pressure high, while one that sticks or leaks internally can drag pressure low and let clutches slip.
Start with fluid level and condition, because low ATF+4 alone will set a low pressure code. Then compare desired and actual line pressure on a scan tool, and if they disagree, put a mechanical gauge on the case test port; Chrysler's procedure uses adapter 8259 and expects the gauge and the sensor reading to agree within about 10 psi. If the gauge matches the sensor and both are wrong, the problem is pressure control. With the 23-pin connector off, Sonnax lists the pressure control solenoid at about 3.5 ohms. Our 45RFE pressure control solenoid and line pressure code guide walks through each step, and the pump failure guide covers the low pressure cases that a new solenoid will not cure.
This listing is for the 45RFE in 2004 model year vehicles. In 2004 the assembly still carries all six shift solenoids plus the pressure control solenoid; Sonnax notes the overdrive solenoid was dropped from the 2010 and later version, so later packs are not a swap for this year. Some 2004 trucks used the 545RFE instead, which has its own 2004 545RFE pressure control solenoid listing. Before ordering, pull the old assembly and match the connector and the part number on its label against the photos, or send us the year, model and VIN and we will check it for you. The full lineup is on our 45RFE and 545RFE parts page.
If the gauge shows low pressure even with a good solenoid, look at the pump and valve body next. A 45RFE valve body for 1999-2010 is the usual next step when the bores are worn.
| Fits | 45RFE 2004 |
| 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 45RFE the pressure control solenoid is built into the solenoid and pressure switch assembly, so the part is the complete assembly shown in the photos. Chrysler does not service the pressure control coil separately on this transmission.
It fits 2004 trucks with the 45RFE. Some 2004 Ram 1500 models used the 545RFE, which has its own listing. Match the connector and the label part number on your old assembly to the photos, or send us your VIN and we will confirm.
Yes. The sensor and the solenoid work in one closed loop, so a sensor fault can make the computer command the wrong pressure. Codes P0932 or P0934 point at the sensor circuit. Verify with a mechanical gauge before replacing anything.
ATF+4 only. Other fluids change friction behavior and can cause harsh or slipping shifts that look like a pressure problem.
Yes. Chrysler calls for the Quick Learn after the solenoid assembly is replaced. It needs a scan tool, the brakes applied, the engine running above 500 rpm, closed throttle and fluid between 60 and 200 F.
