545RFE Governor Pressure Solenoid, new and ready to install. Fits the 545RFE. Ships fast from the USA.
A 545RFE that bangs into reverse, slips out of fifth, or suddenly locks itself in third with the light on is a common story in Ram 1500, Durango, Grand Cherokee and Commander owners' searches, and many of those searches use the phrase "governor pressure solenoid." The five-speed RFE has no governor at all. What it has is a line pressure sensor that feeds the controller actual pressure, and two speed sensors that tell it what gear it is in. This service kit replaces all three and adds the parts you would otherwise buy separately for the same job: a 4WD sump filter, a spin-on cooler return filter and a pan gasket.
The 545RFE is the five-speed version of the 45RFE, with a 0.67:1 fifth gear added to the 3.00, 1.67, 1.50, 1.00 and 0.75 ratios it shares with the four-speed. More gears means more ratio checks. The controller divides input rpm, read from the 60-tooth input clutch hub, by output rpm, read from the 30-tooth park gear, and compares the result to the gear it commanded. A speed signal that drops out for a moment looks exactly like a slipping clutch, and the controller reacts the same way: it sets a code and defaults to third in Drive.
Line pressure works the same way. Chrysler's controller calculates a torque-based target pressure, sets the pressure control solenoid's duty cycle, and reads the line pressure sensor to see whether it got there. During shifts and in park and neutral the target is a fixed 120 to 135 psi. A sensor that has drifted makes the controller chase a number that is not real, so shift feel goes wrong even when the hydraulics are fine.
Start with Chrysler's pre-diagnostic routine: correct fluid level, a fully charged battery, engine codes repaired first, and all transmission codes and event data written down before the battery is ever disconnected. With a scan tool, check the input/output ratio at steady cruise in each gear, including fifth at 0.67. A steady correct ratio that drops to zero and back means a sensor or wiring dropout. A steady but wrong ratio means the sensors are honest and a clutch is slipping, which our 45RFE / 545RFE valve body testing guide helps track down. For pressure codes, compare desired and actual line pressure as covered in the line pressure code guide.
The sensors fit the 545RFE as used in the Ram 1500, Durango, Jeep Grand Cherokee and Commander, and the V8 Ram 2500 and 3500 applications that use the 545RFE; they are shared with the 45RFE. The sump filter in this kit is the 4WD style. Chrysler's capacity chart shows 6.2 L service fill on 4x4 against 5.2 L on 4x2 because the sump differs, so a 2WD truck needs a different filter. The spin-on filter only applies to cases that carry the external cooler filter. Match your old sensor shape and connectors to the photo, or give us the year and VIN before ordering. All 45RFE and 545RFE parts are listed on our RFE collection page.
Plan this as a fluid service. Drain and drop the pan, swap the 4WD sump filter, clean the pan and magnet, and install the new gasket dry and evenly torqued. The speed sensors come out of the left side of the case and the line pressure sensor threads into the outside of the case, so check the O-rings seat squarely before tightening. Change the spin-on cooler filter while you are there, then refill with ATF+4 and set the level hot at idle in park. Clear codes and let the controller relearn. If shifts are still harsh with good sensor data, look at worn accumulators, where a billet accumulator piston kit helps, or at the 545RFE valve body itself.
| Fits | 545RFE |
| 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 545RFE is fully electronic with no hydraulic governor. The part most people mean is the line pressure sensor, which this kit includes along with both speed sensors.
The input speed, output speed and line pressure sensors are shared between the 45RFE and 545RFE. Check your connector style against the photo if your unit has been changed or swapped.
The sensors and pan gasket will fit, but the sump filter is the 4WD version. A 2WD 545RFE needs the 2WD filter.
It can feel that way. An intermittent input or output signal makes the controller see a wrong gear ratio and default to third. Watch input and output rpm on a scan tool before replacing hard parts.
ATF+4 only. Chrysler lists about 5.2 L for a 4x2 service and 6.2 L for a 4x4 service; set the final level by dipstick at operating temperature.
