Your transition solenoid has actually likely unable to do bad, especially if you have actually been thrown a P code indicated as such with an OBD-II scanning tool.

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This article uses to the Jeep grand Cherokee WJ (1999-2004).

If your jeep has actually started shifting difficult or no shifting right into the ideal gears, you might have a bad transmission in ~ worst, or hopefully, it"s simply the solenoid that has actually gone bad. The automatic change solenoid is the most likely culprit and also fortunately, the is not almost as expensive to replace as an entire transmission. If you have thrown part "P" codes, acquire them scanned at a neighborhood auto parts store if girlfriend don"t have actually your very own OBD-II scanning tool. This should pinpoint her problem. If it"s just the solenoid that has actually gone bad, you are in luck. This part can be replaced on your own, also if you have limited mechanical skills. This task isn"t too difficult to carry out on her own, however it is a bit facility and will certainly take significant time. If it is other you want to tackle, follow this instructions and also you"ll be very happy through the amount of money the you"ll save from taking it to a pro. If you room at every squeamish about such one undertaking, make sure you shop around and get a professional you can trust to prevent paying for extr work the you may not need.

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Materials NeededT25 Torx little with ratchet0-250 in/lb talk wrenchOil capture panTransmission filter kitReplacement transmission liquid with funnelPlenty that shop rags

Step 1 – Disconnect her battery

Disconnect her battery by removing the negative (black) battery terminal. This will keep your electronic contents safe, as well as erase the problem codes the you have actually likely been getting.

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Figure 1. Disconnect the battery before beginning your work.

Step 2 – Jack up your Jeep and also place top top jack stands

Use a hydraulic floor jack to lift the front end. Place on jack stand in the approved areas only. Never ever work under any vehicle that is secured just with a floor jack.

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Figure 2. Always use the exactly jack points to collection your Jeep on jack stands once working under it.

Step 3 – Make certain you know your transmission model

Before you change the solenoid packs, make certain you recognize the correct model of transmission on your Jeep. On the next of the transmission case, you should uncover a bar code through the transmission form printed top top it. If you do not complement the exactly transmission form with the instead of solenoid, it will certainly not to the right correctly.

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Figure 3. This is the version 45RFE transmission. Make certain your solenoid matches up with your transmission version.

Step 4 – Prepare to eliminate the infection pan

There are about 14 come 15 8mm bolts attached to the infection fluid drainpipe pan under your Jeep. Take into consideration using part WD-40 or PB Blaster on each bolt to gain them lubed increase nicely before taking them off. A consistent 8mm socket will work, yet an extender may make them a bit easier to job-related with. Be sure to have a catch basin in location very first and remove the rear of the pan first. The old fluid will start pouring once you remove the behind bolts and also you want to make sure you record the fluid, together it is an extremely slick. Once the liquid has drained, you may want to run a magnet with it to inspect for steel debris and ensure the you don"t have actually any major transmission worries looming. If the fluid is quiet draining, now is a great time to use a putty knife come scrape off the old gasket residue native the lip of the pan.

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Figure 4. Fall the transmission liquid pan and also make sure you catch all the old liquid in your container.
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Figure 5. Usage a putty knife to remove the old gasket residue therefore the brand-new gasket will make a good seal and avoid any type of leaks.
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Figure 6. Check the condition of her old liquid to recognize the condition of your transmission.

Step 5 – Remove inner automatic infection cartridge and filter

The internal transmission cartridge is an installed using just a single Torx 25 bit. This is the just special device that is needed for this job. Remove the bolt and the cartridge; it simply pulls right out, however be careful due to the fact that it is fill with fluid as well and also is pretty messy if girlfriend tilt it while removing it. There is additionally the huge round filter that deserve to be removed, yet it may be ~ above there really tight. The filter might not need replaced, however it can"t hurt because you are currently there at this point.

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Figure 7. A single 25mm Torx little is required to remove the cartridge. Be cautious as that is filled with ATF.
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Figure 8. Dump the old fluid from the cartridge. Her cartridge deserve to likely be reused.
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Figure 9. If you can remove the ATF filter, currently is a an excellent time to change it since you currently have access to it.

Step 6 – Disconnect the wiring harness because that the solenoid

The solenoid is placed on the infection valve body, and the wiring harness plug from the solenoid seats just over the infection label presented in action 10. There is a retaining clip the you have to pop down first and then you may need to use a small flat head screwdriver to press up ~ above the harness to disengage it.

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Figure 10. Disconnect the wiring harness because that the solenoid.

Step 7 – eliminate the infection valve body

There are about six 8mm bolts the mount the transmission valve human body to the bottom the the transmission. These need to be removed; back it"s not going to fall right out, the does call for some wiggling and it should come appropriate off. Be careful as this has significant weight come it, so be sure to have control of the while you room wiggling that to get it out.

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Figure 11. Eliminate the six 8mm bolts to drop the valve body.
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Figure 12. The solenoid is placed on the valve body with numerous T25 Torx bits.

Step 8 – eliminate solenoid and also early range sensor plate

Flip the valve body end to get access to about 15 T25 Torx bits the mount the solenoid ~ above the body. Remove every one of the bits to obtain the solenoid off. There is one early variety sensor plate held on by two shoulder screws (T25 also) that demands to come off, as well.

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Figure 13. All of these T25 bits require removed to gain that solenoid off of the valve body.
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Figure 14. As soon as the T25 bolts are removed, upper and lower reversal the valve body earlier over and the solenoid lifts right out.
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Figure 15. Change the early selection sensor plate. When the solenoid is removed, this bowl is organized on v two T25 shoulder bolts that needs to be removed.
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Figure 16. Once the new plate is installed, be certain to torque the larger T25 to 40 lb/inch.

Step 9 – Install brand-new solenoid

Your brand-new solenoid need to plug appropriate in. Every the T25 bolts must line up precisely with the feet on the valve body. This is why getting the exactly transmission model number is critical. As soon as re-mounting the brand-new solenoid and carefully flipping end the valve body, install the 2 T25 bolts alongside the arrows first. Every one of the T25 bolts should be torqued come 50 lbs/inch.

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Figure 17. Brand-new solenoid have to plug right in place.
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Figure 18. Install the 2 T25 bolts indicted through the arrows first. Torque every one of the bolts to 50 lbs/inch.

Step 10 – Remount valve body

Before you reinstall the valve body, make certain that you have actually a clean surface for mounting. There will be old gasket material that needs cleaned off of the mounting allude for the valve body. Use your putty knife to get all the old product off the mounting surface. Download the brand-new valve body gasket and prepare the valve body because that re-installation. Over there is a latch on the bottom of the transmission that fits into the U-shaped change indicator lever on the valve body. Make sure that the valve body is in the park position, so that slides in easily. Once it is in place, reinstall the six mounting bolts and also they must be torqued come 105 lb/inch.

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Figure 19. Clean the mounting surface before reseating the valve body.
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Figure 20. This latch requirements to marry as much as the latch seat on the valve body.
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Figure 21. The valve human body latch seat should be in the park position to marry as much as the infection latch.

Step 11 – Test your shifter

After you have an installed the valve body and also before you start buttoning everything earlier up, test her gear shift first. Perform not start your engine, however turn the vital to the on position. Shift through all the gears to make sure you have the right to feel the plate hit every gear and also they click right into place as normal. That is much much better to make sure this is correct and also not have to tear everything apart again.

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Figure 22. Test the shifting pattern and also make sure all clues click right into place together it should.

Step 12 – placed it all ago together

Once you room satisfied that the valve body is in correctly, you can start putting the rest of her ago in order.

Replace the internal cartridge and also tighten that single T25 Torx bit. The doesn"t need to be torqued, just snug.Install the new gasket top top the transmission fluid pan. Insert few of the bolts an initial to make sure the gasket is in location correctly.Plug the solenoid wiring harness back in and make sure to press up on the latch till it locks in place.Re-fill her Jeep v the exactly automatic transmission fluid, almost everywhere from 5-8 quarts.Let the Jeep sit for number of minutes and also then transition through the gears to occupational it all in before starting.If you don"t have an OBD-II scanning tool to clear any kind of P-codes, take it it to an auto parts store and they deserve to do it because that you, making certain that you corrected the problem.
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Figure 23. Insert a few bolts into the mounting feet to make certain you obtain the gasket inside wall up correctly.

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Figure 24. Refill her automatic transmission fluid to the suitable level.

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