68RFE Pressure Control Solenoid 2013-2018, new and ready to install. Fits the 68RFE. Ships fast from the USA.
Although this listing carries a pressure control solenoid name, the part that ships is a RevMax replacement transmission cooler thermostatic bypass valve, part number 68RFE-929AA, for 2013-2018 Ram 2500 and 3500 trucks with the 6.7L Cummins. It replaces the factory bypass sold under OE numbers 68186711AB and 68492206AA. If your truck's transmission temperature climbs on every grade, runs hotter than it did when new with the same trailer, or the cooler feels cool while the pan is hot, this is the part to look at. It does not change line pressure and it is not a solenoid, so if you are chasing a solenoid code, see the guides linked below instead.
From 2013 on, the 6.7L Ram routes transmission fluid through an in-line thermal bypass valve on its way to the cooler. Mishimoto describes the same in-line valve on both the 68RFE and the Aisin AS69RC. When the fluid is cold, a wax element keeps the valve closed and sends fluid back to the transmission so it warms quickly. Once the fluid is hot, the valve is supposed to open and send everything through the cooler. Sonnax lists 68186711AB among the factory valves its thermal bypass eliminator kit fits, which confirms the valve is a separate serviceable part on these trucks. On the 2008 truck described in GEARS Magazine, the bypass was part of the cooler assembly and the fix was a whole new cooler.
The factory valve fails in two ways. It can stick in its cold, closed position, so the cooler never gets the fluid. And even when it works, it is restrictive. RevMax's listing says the factory valve cuts cooler flow by about 87 percent and that sticking bypass valves have cooked transmissions. Its billet aluminum version is built to give an unrestricted flow path once open.
Start with what GEARS Magazine recommends. The ideal maximum fluid temperature is 200 degrees F, and every 20 degrees above that halves the expected life of the transmission. Cooler flow should be at least one gallon per minute. Disconnect the cooler return, run it into a container at idle for 15 seconds and measure. Low flow with a clean filter and straight lines points to the bypass or a plugged cooler. With the engine at operating temperature, feel or infrared-check both cooler lines: a large temperature difference across the valve with a cold cooler outlet means it is not opening. Rule out the engine cooling system and fan first. Our 68RFE Ram 3500 guide walks through the heat checks for the 1-ton trucks.
The listing fits 2013-2018 Ram 2500 and 3500 trucks with the 6.7L Cummins and either the 68RFE or the Aisin AS69RC, as a replacement for OE 68186711AB or 68492206AA. Before you order, compare your factory valve with these numbers. Trucks from 2019 on use a different bypass design, so a 2019 or newer owner should look at the 2019-2024 thermal bypass valve kit. If you are not sure which valve your truck has, send us the year and VIN and we will confirm it. You can see every part for this transmission in our 68RFE parts collection.
Work with the engine cold. Clamp or plug the cooler lines, put a pan under the valve, then unbolt the factory bypass and transfer the line fittings to the new valve. Use fresh O-rings on every connection you open. If the truck has overheated or the transmission has just been rebuilt, flush or replace the cooler before you fit the valve, because debris in the cooler is what jams these valves. Top up with ATF+4 only. Then check the level with the fluid hot; the FCA service instructions for this transmission family say fluid must be at least 160 degrees F before the level is set. Do a filter service at the same time; the 68RFE filter kit covers the 2WD trucks. If the old cooler is cracked or packed with debris, replace it with the 68RFE transmission cooler while the lines are already off.
| Fits | 68RFE 2013-2018 |
| Part type | Pressure Control 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. Despite the listing name, this is a replacement transmission cooler thermostatic bypass valve, part number 68RFE-929AA, for 2013-2018 Ram 6.7L Cummins trucks. It controls fluid flow to the cooler and has nothing to do with line pressure or shifting.
No. It is listed for 2013-2018 trucks only, replacing OE 68186711AB or 68492206AA. From 2019 on, the trucks use a different bypass. Look at our 2019-2024 bypass kit instead, or send your VIN and we will match it.
Yes. The listing covers 2013-2018 6.7L Cummins trucks with either the 68RFE or the Aisin AS69RC, because both run the same in-line bypass in the cooler circuit.
ATF+4 only. You will lose some fluid when you open the cooler lines, so top it up and set the final level with the fluid hot, at least 160 degrees F.
Measure cooler flow at the return line. It should be at least one gallon per minute. Then compare line temperatures across the valve with the truck hot. A cool cooler outlet, a hot pan and low flow with a clean filter point to the bypass.
