Question about 2002 Jeep Grand Cherokee

3 Answers

I have a 2002 Jeep Grand Cherokee that won't shift out of 1st gear until I get up to about 4500 RPM's

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3 Answers

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  • Jeep Master
  • 20,706 Answers

And does not slip?
i think this is an electronic shifted trans, like 42RE.
so check fuses first.
then scan it.
the scan tool while driving will show DTC , errors
like P07xx errors. for trans, and are real.
post them. there is no other way, to do this.
i bet it chock-a-block full of errors. is bet.
no looking misses the boat.

Posted on Mar 28, 2015

  • 17 more comments 
  • John Torres III Mar 28, 2015

    It doesn't slip unless I go around a corner it's weird it will like go in neutral then back in gear. It didn't throw a code sorry I forgot to put that down. Yes it is the 42RE.

  • _-__-___-_
    _-__-___-_ Mar 28, 2015

    the tcm needs to be scanned moving, to see all errors and for sure intermittants. if you are in drive, truely, and the TCM seens it shift wrong, the TCM will report that , if not , your scan tool is toy grade. sorry, but many are. try an innova 3160, see if it finds them all, id bet yes. keep in mind there are federal p0 codes, then p2, p2, codes for jeep that most not be ignored. called factory codes.

  • _-__-___-_
    _-__-___-_ Mar 28, 2015

    the TCM watches tail shaft rpm, so if the TCM commands say 2nd gear and the tail is spinning in 1st gear that is a HARD DTC failure, and it is reported. that is all fact. for most TCM trans cars.

  • _-__-___-_
    _-__-___-_ Mar 28, 2015

    some cars even have TCM tranny back in 1992.

  • _-__-___-_
    _-__-___-_ Mar 28, 2015

    so this is nothing new, only how to scan a tranny is tricky!

  • _-__-___-_
    _-__-___-_ Mar 28, 2015

    that false neutral is called flare. (make sure the shift cable is good, and Drive really is DRIVE.

  • _-__-___-_
    _-__-___-_ Mar 28, 2015

    a tad off and you do get neutral on the shifter.

  • _-__-___-_
    _-__-___-_ Mar 28, 2015

    ok, cable good, keep in mind the sensor to TCM must be good and the TCM solenoid control lines must be correct. or the trans will not shift. or shift wrong. seem like a cable to me.... but./.. im not driving. it.

  • John Torres III Mar 28, 2015

    Thanks a lot I didn't know it had to be driving but it makes sense. I appreciate you.

  • _-__-___-_
    _-__-___-_ Mar 28, 2015

    depends, after all things can be weak or intermittant, to find problems, best is to scan it when its failing very hard. for sure going fast, no idle, as going fast , the TCM sees the profound error and then , trips a DTC error do to that fact. (this is true for all intermittants and a tech, lays in traps to find failures. with his gauges or meters. or scantools.

  • _-__-___-_
    _-__-___-_ Mar 29, 2015

    post real transmission model number, what is it? exactly. some dont have a detent valve on electric shifted transmission, this is now software that does passing gear, not TV valve. yes, i know nobody ever looks at trans case first. and read that tag . WJ jeep. 02 some have the 42RE box, and is TCM shifted, 100% (no detent, no vac, modulators, governor) 100% shifted by computer logic, and as such , if inputs are wrong so will be outputs, (solenoids) so scan it. there is an electronic governor here, not like old school (flyweights) if you need the FSM pages on this 42re box, ask, its extensive ..

  • _-__-___-_
    _-__-___-_ Mar 29, 2015

    as always, on all electrics, check fuses first. then all connector the green monster (corrosion,) as always forever and ever..... electrics, or wire damage there, or road hazard damage, or past collision damage, or off road damage there,

  • _-__-___-_
    _-__-___-_ Mar 29, 2015

    not only that the scans can tell you that a sensor is bad, or the solenoid outputs are shorted, or open or dead. scanning it is always a 1st thing (after level checks and fuses, and damage checks)

  • _-__-___-_
    _-__-___-_ Mar 29, 2015

    let the TCM talk to you, on all cars with a TCM. (TCM can be a box or is part of PCM on all cars)

  • _-__-___-_
    _-__-___-_ Mar 29, 2015

    it can also be the 545RFE box.

  • _-__-___-_
    _-__-___-_ Mar 29, 2015

    ill qoute page 1, fsm on that box.

  • _-__-___-_
    _-__-___-_ Mar 29, 2015

    The hydraulic control system design (without electronic assist) provides the transmission with PARK, REVERSE, NEUTRAL, SECOND, and THIRD gears, based solely on driver shift lever selection. This design allows the vehicle to be driven (in “limp-in” mode) in the event of a electronic control system failure, or a situation that the Transmission Control Module (TCM) recognizes as potentially damaging to the transmission. The TCM also performs certain self-diagnostic functions and provides comprehensive information (sensor data, DTC’s, etc.) which is helpful in proper diagnosis and repair. This information can be viewed with the DRB scan tool

  • _-__-___-_
    _-__-___-_ Mar 29, 2015

    as you can see, the software in the TCM can shut down shifting, , one way is for the rear RPM sensor (VSS) reading zero all the time.

  • _-__-___-_
    _-__-___-_ Mar 29, 2015

    The TCM (where ever it my be) will not up shift until it see the proper, tail shaft speeds. for each gear. That is how it shifts, (slipping is a total other matter) failure to shift, we need to find out if TCM even attempted to shift it. first.

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  • Master
  • 708 Answers

Defective electronic detent controller, replace and it should work fine. Don't forget to check for bad or green wires and check connectors.Make sure they are secure and there are no green or corroded wires in connectors before replacing part as any of these can result in failure of the unit.

Posted on Mar 28, 2015

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  • Expert
  • 38 Answers

Its the transmission either get it fix, flushed, or replace... however i would get fit of it.

Posted on Mar 28, 2015

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2002 Jeep Grand Cherokee jeep

you might try a governor sensor and solenoid

Posted on Dec 23, 2008

motor1258
  • 6674 Answers

SOURCE: jeep will not shift till about 4500 rpm or if you

Follow cable from throttle linkage area to transmission. Check that where it attaches, to transmission, moves freely with gas pedal to floor & then released. Vehicle off, in park obviously. It may be a seized throttle valve linkage, just apply penetrating lube like WD-40, and try getting it to move farther & more free by hand, as well as with pedal until it returns all the way as it should. Let me know what you find.

Posted on Jul 11, 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

  • 52 Answers

SOURCE: Auto matic trans. 4x4 slec-trac. Won't shift into

Need to adjust the selector cable

Posted on Sep 21, 2010

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1 Answer

2005 jeep grand cherokee laredo transmission shifting problems


  • A/T or M/T (auto or stick, gee)
  • if A/T is this the 42RE box>? are you in DRIVE? or 1 or 2 gear.
  • does rpm rise above 3000 rpm > at your attempt? if not ,its a bad engine (weak)
  • is the shift linkage even shifting correctly (movement top and bottom)
  • check levels yet. (and for pink ./red AFT not black-metal flake
  • change the filter yet? or skip service. at 50k miles. ?????
  • check all fuses yet>?
  • using a basic OBD2 scan tool are there any tranny DTC errors?>
  • does the FSM stall test pass? in 1st.? and reverse?
  • if stall fails, slips , then tranny bad. if not its really stuck in 1st gear.
The TCM commads the gear change, there is no valve body brain.
the TCM shifts to second with good inputs to the TCM
if the TCM sees bad inputs it will tell you, SCAN IT.

Sep 14, 2014 | 2005 Jeep Grand Cherokee

1 Answer

Won't shift out of 1st. gear


Hi your problem is an easy one to solve. The trasducer in your transmission is out of calibration. The best thing is to have it replaced by your competent mechanic. The replacement part should cost you about $150.00 plus labor. Happy shifting.

Mar 11, 2013 | 1994 Jeep Grand Cherokee

1 Answer

My jeep won't shift out of 1st gear


bad shift silonoid or possibly the pressure sensor,also could be a clogged filter.

Apr 14, 2010 | 2002 Jeep Grand Cherokee

1 Answer

My 96 Jeep has trouble shifting from 2nd to 3rd gear.The rpms go up to 4500 then it shifts.


That sounds like the 1st thing to check is the transmission fluid.Start the car ,warm it up,now shift through all the gears and stop in (N).With the engine running,check the fluid level.Top up if needed.If you do,look for leaks.Hope this helps

Feb 02, 2010 | 1996 Jeep Grand Cherokee

1 Answer

02 jeep grand cher. stays in 1st gear till 4500 rpm's before changing. I replaced the transmission speed sensor and it was fine for about 3 weeks then started it again. Would a shift solenoid sensor help...


Which trans do you have??? The 4.7 has the 45RFE and the 4.0 has the 42RE. If you have the 42RE, try replacing the connector on the output speed sensor. I have seen intermittent problems with the connectors as they get older leading to falling into low gear and not shifting up

Apr 02, 2009 | 2002 Jeep Grand Cherokee

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