45RFE Governor Pressure Solenoid, new and ready to install. Fits the 45RFE. Ships fast from the USA.
If you searched for a 45RFE governor pressure solenoid, you are probably chasing harsh engagements, flares, a drop into limp mode or a P0715, P0720 or line pressure code on a Dodge Ram 1500, Dakota, Durango or Jeep Grand Cherokee, Liberty or Commander. The 45RFE never had a hydraulic governor, so the part people mean is the line pressure sensor, the small three-wire transducer that does the job a governor pressure sensor did on the older RE units. This kit includes that sensor plus the two parts that most often get blamed alongside it: the input speed sensor and the output speed sensor. It also includes a 4WD sump filter, a spin-on cooler filter and a pan gasket, so the sensor job and a full filter service happen in one trip under the truck.
The 45RFE is fully electronic. The controller decides every shift from two numbers and checks every shift with a third. The input speed sensor reads the 60-tooth input clutch hub to get turbine speed, and the output speed sensor reads the 30-tooth park gear to get output speed. Both are two-wire magnetic pickups mounted in the left side of the case. Dividing one by the other tells the controller which gear the transmission is really in and how long each clutch takes to apply.
The line pressure sensor closes the pressure loop. Chrysler regulates line pressure by changing the duty cycle of the pressure control solenoid, then reads actual pressure back from this sensor and corrects. If the sensor reads high, the controller pulls pressure down and the clutches slip. If it reads low, pressure goes up and engagements get harsh. A sensor that drifts can make a healthy transmission feel worn out.
Record every code and the event data before anyone disconnects the battery, because a battery disconnect wipes learned values. Then watch input and output rpm on a scan tool. At a stop in neutral, output should read zero; output reading about twice input points to the shared sensor ground rather than the sensors. For pressure, Chrysler's own quick check is to push on the line pressure sensor connector with the engine off; a jump to about 30 psi means a bad connection, not a bad sensor. Our 45RFE pressure control solenoid and line pressure guide walks through the desired-versus-actual pressure checks, and the 45RFE speed sensor guide covers the rpm and wiring tests.
The kit is built for the 45RFE in 1999-and-later Dodge Ram 1500, Dakota and Durango and Jeep Grand Cherokee, Liberty and Commander, and the same sensors are shared with the 545RFE. Two things vary. The sump filter supplied is the 4WD pattern: Chrysler lists a 6.2 L service fill for 4x4 RFEs against 5.2 L for 4x2 because the sump is different, so a two-wheel-drive truck needs the 2WD filter. And early cases without the external spin-on filter simply will not use that piece. Compare your old sensors, connectors and filter to the photo, or send us your year and VIN and we will check it. Browse everything for this unit on our 45RFE parts page.
The speed sensors and the line pressure sensor all come out from outside the case, so the sensors alone do not require dropping the pan. Since this kit carries a filter and gasket, do both at once: drain, drop the pan, replace the sump filter, clean the pan and magnet, and fit the new gasket. Replace the spin-on cooler filter if your case has one. Lightly lube new O-rings with clean fluid, keep connector terminals clean and fully seated, and refill with ATF+4 only. Check level hot in park at idle. Clear codes afterward and drive gently while the controller relearns shift volumes. If line pressure codes come back with good sensor readings, the problem is inside the unit; the 2004-up 45RFE solenoid pack or a 45RFE overhaul kit is the next step.
| Fits | 45RFE |
| Part type | Governor Pressure Solenoid |
| Condition | New |
| 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. The governor pressure solenoid and sensor belong to the older 42RE, 44RE and 46RE. The 45RFE measures line pressure with a line pressure sensor and reads road speed with input and output speed sensors, which are what this kit contains.
Input speed sensor, output speed sensor, line pressure sensor (transducer), a 4WD sump filter, a spin-on cooler filter and a transmission pan gasket.
The sensors and gasket fit 2WD and 4WD 45RFE units, but the sump filter supplied is the 4WD pattern. A 2WD truck needs the 2WD filter. Send your year and VIN if you are unsure.
P0715 and P0720 for the speed sensors, and P0932, P0934 and P0935 for the line pressure sensor circuit. Check wiring and the shared sensor ground first, since P1794 or a pushed-back terminal can mimic a failed sensor.
ATF+4. Chrysler lists a 5.2 L service fill on 4x2 and 6.2 L on 4x4, but always set the final level with the dipstick, hot, in park at idle.
Clear the codes with a scan tool and drive normally. The controller adapts shift volumes on its own over the next drives; a scan tool quick learn speeds that up.
