If it's 4WD it may be ABS sensors. If the computer sees either the front wheels going faster than the rear or vice verse it engages the transfer case. If it still sees the condition it will shift the trans into neutral. Probably one of the sensors on the front.
SOURCE: 2000 jetta auto trans won't shift out of park after starting
that is a TSB you may have a bad valve body, olso this condition may turn malfunction ligth on, or if you remove the air intake pipe
on trans there is a conector that go to trans valve body some time come lose pluged back an reset PCM if don't fixed will be the trans valve body
SOURCE: my 1992 plymouth grand voyager wont shift out of first
Have the transmission computer scanned for codes. This trans is completely electroniclly shifted.
SOURCE: 2004 dodge ram 2500 5.7 hemi when driving it
Sounds like a coil problem, I don't know how the ignition systems work in the hemi's but your coil could be overheating.
SOURCE: I HAVE 1994 JEEP GRAND CHEROKEE LAREDO 4.0 ALL
Well, there aren't really THAT many clutches in an automatic trans. The older ones had 2 or 3 and 2 band brakes that controlled 2 or 3 forward speeds and reverse. Newer ones have one or two more for overdrive and more speeds. Your jeep is more like the older style, with a lockup torque converter added. The original problem sounded like a piece of contamination in the tailshaft governor, and the best thing was (once it started working again) to leave it alone. The old Chrysler owners manuals told you not to touch the transmission, EVER, unless it was being used for a taxi or towing. The risk of additional contamination far outweighed the benefits of changing the fluid. Your problem now sounds like the valve body is contaminated and something is stuck. There are lots of little spools and valves that are machined to very tight tolerances. Little fibers from clutch wear and filter changes can cause this. It's got pressure, and it's still got clutches (it wants to be in 1st gear). A new valve body is a good bet to fix the problem, but the best thing is to take it to a transmission guy you think you can trust to test the pressures in the valve body and determine what is actually stuck and tell you if it can be repaired or needs replacing.
SOURCE: 1994 Jeep Grand Cherokee V8. limited addition shuts off.
fuel filter is clogged try replacing it
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