Just has this problem on my 2007 Grand Cherokee 5.7 with the Chrysler 545RFE. Current mileage is 120,000. Was shifting fine, then one day I go out to do some errands and it won't go into any gear. No warning, no slip, no fluid leaks, etc. Then a code popped up P0944 lost of pump prime. Did some reading and learned it could be clogged trans filters, a defective spin on filter (there are 2 in this trans, a flat normal filter and a spin on that is for the cooler circuit). Sucked out as much fluid as I could with my vacuum pump (no drain plug) then dropped the pan and got a total of 8-9 qts. Looked in pan, it is quite clean, magnet has hardly anything on it. Filters looked ok, main filter not split, then I go to remove the spin on thinking it will be tight, but it isn't. Didn't even need a filter wrench to get it off which in my 50 years of doing oil changes is not typical. Installed main filter seal in the housing, installed both filters (the spec for that spin on is about 10 ft lbs) cleaned pan and re-applied RTV. Installed pan and let cure overnight, used Chysler ATF RTV, filters and ATF+4. Filled it up and ran it through the ranges and it's acting fine again. I saw 2 you tube vids where this spin filter got so loose it actually came off and was laying in the bottom of the pan. So if you get this symptom, no drive in any gear, and a P0944 code, try replacing the filters first, you might just get lucky.....
a few tips if you have one:
the pan bolts are 8mm be careful with them, I used a 1/4" drive socket with a built in u joint to get the bolts that are next to the cat converter and the exhaust pipe that snakes around the pan, on this job a 3/8" socket and extensions would be too big
Clean everything up well including the threads on the bolts, I also blew the bolt holes in the pan out with compressed air and made sure the bolts would thread back in before bolting up the pan.
You just don't want to break any of those little 8mm bolts or cross thread them going back in...
a few tips if you have one:
the pan bolts are 8mm be careful with them, I used a 1/4" drive socket with a built in u joint to get the bolts that are next to the cat converter and the exhaust pipe that snakes around the pan, on this job a 3/8" socket and extensions would be too big
Clean everything up well including the threads on the bolts, I also blew the bolt holes in the pan out with compressed air and made sure the bolts would thread back in before bolting up the pan.
You just don't want to break any of those little 8mm bolts or cross thread them going back in...
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