Question about 1999 Jeep Grand Cherokee
Jeep runs 1st 2nd then a slip in 2nd, shifts to 3rd then 4th but then wont down shift if say travelng up hill. No codes. cel is not on. i can manualy shift to drive and it has no problems
Cel means nana, scan it.
ok , as with all a/t
1: CHECK FUSEs.
2: Check levels, ATF
3: do the full flush and filter and pray magic. (i have no hope)
4: the more you slip it the more damage to those clutch packs.
diagnose slip, that is a big show stopper.
see thje on car tests for this A/T here.
Posted on Mar 26, 2014
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Posted on Jan 02, 2017
First of all make sure you are checking the fluid right. Some people do not know that in order to check transmission fluid the engine needs to be running and the temperature needs to be sort of warm althought you should be able to get a good Idea just by the engine running. In this instance you might have a governer valve that isn't properly working to shift the engine when hydraulic pressure reaches a certain PSI. I would suggest having it flushed and put in new fluid and filter. If this doesn't work the problem is more serious and might need some professional assistance.
Posted on Oct 14, 2008
sounds like the transmission is in "limp"mode it allows you to drive even though there is a problem with the transmission,the code 21 is probably a transmission manufature control code and not engine go to autozone and they can scan it for free,if you just had transmission fluid changed recently if you used anything other than what the manufature calls for like atf+4 then this is your problem,flush the system and do a fluid and filter change with correct fluid as by what the owners manual,or dealer calls for,don't rely on autozone to get it right.
Posted on Dec 25, 2008
Reboot system by disconnecting negative terminal on Battery, with ignition Key on and engine not running, remove terminal for more than two minutes and connect it back, it will spark a little do not panic, and try it again
Posted on Feb 01, 2009
SOURCE: Transmission problem
I had a shifting problem. The car would start in the wrong gear and shift at wrong times. I repaced the governor postion sensor and tranny fluid and the problem has been fixed for several years. Did you replace the tranny fluid?
Posted on Mar 07, 2009
Check the Trans fluid level with it running and at operating temperature. Jeep NAG1 transmissions are known to have the input electric seal leak trans fluid. Not an exspensive fix add Mopar ATF4 and then relace the guild seal.
Posted on Jul 20, 2009
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