Question about 2001 Jeep Grand Cherokee

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I have a 42re trans (4x2). My previous trans would always pull out in 2nd gear shifting regular thru the rest. Rarely did it pull out in 1st gear. Eventually the trans went while on the highway. Vehicle trans shifted all over the place. I replaced my trans (keeping the old wiring) and found that it would not shift out of 1st gear. The kicker is that there is NO engine light on...... NOR did it produce any codes from my OBD2 scanner. I proceeded to unplug the speed sensor wire, run the engine. I then received an engine light and a fault code. I then erased the code(s). I then proceeded to do (1 at a time) the same to the governor wire connector/ neutral safety switch/TCM relay and the other 2 fuses. All produced the same effect. Engine light on with a fault code. i then erased them. Test drove the vehicle 6 blocks and it still didn't produce a fault or engine light. Problem...... It still doesn't want to shift out of 1st gear. Any help would be appreciated.

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  • Jeep Master
  • 20,706 Answers

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

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  • 1 Answer

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

  • 295 Answers

SOURCE: 2005 Jeep Grand Cherokee Shifting Problems

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

  • 53 Answers

SOURCE: 1999 grand cherokee laredo 4.0 and auto trans wont downshift

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

  • 1 Answer

SOURCE: Speed Sensor - Engine Light - 1998 Jeep Grand Cherokee 5.2

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

  • 1 Answer

SOURCE: I have Jeep GC from 2000 with 4.0 engine, and

i have this same problem with my jeep. i am going to change the shift solenoid out.

Posted on Feb 18, 2010

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