Question about 2001 Jeep Grand Cherokee
2001 grand cherokee?
nor years of all parts swapped.
swaps are super complex topics, endless possibles.
dont expect magic from any TCM.
they cant tell you ever possible way things can be wrong
it will fail to shift right if things are wrong,
the trans TCM can go to limphome mode, read the service manual chapter 21 yet its free, posted here 300 times.
forget the silly engine , light (CEL) use only a scan tool one that can read all factory codes not some $20 tool.
CEL lamp is for failing smog. only. never trust it, if out.
i say bad shift solinoids.
the TCM can see late shift error.s but maybe not all.
stick in 1st is a hard failure.
all inputs to the TCM must be correct for the shift to 2nd happens.
check all inputs.
if those are then see if the TCM did shift to 2nd, but the solenoids ignored the logic inputs to the solenoids.
solenoids have many failure mods
dead. (stuck closed)
stuck open, valve open.
or leaking. (leaking can cause stuck in 1st and confuse any TCM)
leaking means breached, valve leaks where it must not. ever.
Posted on Mar 09, 2017
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Posted on Jan 02, 2017
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
The Transmission Control Module also turns on the check engine light. However the parts store won't be able to read these codes since all they read are the Engine DTC's. More then likely your codes will come back to a Governor Pressure Sensor and/or Switch. If they do then remove the pan and replace both of those. Simple fix, should be able to be done in about an hour or so. Might as well go ahead and slap a speed sensor in while you're under there. Should be able to do it yourself for less then $200.
Posted on Dec 20, 2009
The problem is AutoZone. Stay away from that place. I once worked there and was amazed by the number of returns. They sell low quality parts, most of them rebuilt and listed as new.
The best of the low end parts dealers would be KOI, NAPA, and Carquest. All others blow chunks. Else, just go to the dealer.
Posted on Feb 11, 2010
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