Question about 2006 Jeep Grand Cherokee

1 Answer

Cruise control is working but when i set it to a certain speed it will not hold it & will just accelerate in an insane speed.

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  • pam sellers
    pam sellers Mar 28, 2014

    i can drive it with no problem, since i bought the car it never worked but didn't care since i don't use it but i'm gonna drive cross country so i want it fix. break pedal totally cancels cruise control. nothing has been done to it, went to a mechanic but he can't say whats wrong.

  • _-__-___-_
    _-__-___-_ Mar 29, 2014

    so the brake switch works, the contoller sees it, so is working and the Actuator released. so must be, the cruise accel, button stuck closed. (or the wire to it shorted to ground.) one way to prove that is defeat the accel button wire, Use only the set cruise button. (fix it or defeat it, 2 choices, that button.)



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  • Jeep Master
  • 20,706 Answers

I-6 4.0L or V8? 4.7L???????

thats not a good sign. not at all. NoT road worthy, at all.

pray tell. the brake pedal cancels Cruise , right.>?

sounds like Toyota Disease.?

floor mats hitting throttle pedal?

let me tell you that newer cars can kill cruise for 18 reasons.

but the older the car , the less reasons.

some do , only with brake switch cancel or neutral selection (man killer cars.)

you never posted what engine option is there, or transmission.

on the newer cars, if the TBW , throttle by wire fails.

cruise is rendered Inop.

and goes to limphome. (low speeds and cruise is dead..)

here is the FSM. see chapter called fueling....

btw all my early jeeps had this issue. with bad TPS.

1988 to 1999

my 08 , no.

all MAP based speed densty fuel systems at risk (by its nature)

to have excessive RPM.

any air leaks.

or throttle jammed open.

or vacuum leaks,

on the new cars its has a new check to see that that dont happen.

RPM - and manifold vacuum, do not match TPS angle.

in gringo that means the engine actions dont match your right foot.

i then drops , cruise, and then goes to limphome mode on all newer cars. my wrangler this happened beginning for 07, but its 3.8L V6.

the mech, would first makes sure the engine runs perfect

by driving. it , and then using a scan tool (rent one) and see if there

are any DTC error any where. a FULL SCAN.

first see page 50 , (FSM) fueling, figure 37]

see that, see those cables,

you need to find out of any of those are sticking.

as you can see the Cruise control has its own CABLE

so both it , the control actuator or the cable can stick.

these need careful, checking per the FSM.

sadly my FSM above has bugs (its not really mine, just my link)

has an error in the speedcontrol chapter, you can see it. has all this, log in and read.

the key to finding this, is.

does the brake pedal cancel it.


if no. then the Cruise acuator or something else has jammmed

open the throttle. ( or any gross air leak to engine induction)


Posted on Mar 28, 2014

Testimonial: "hmmm... so what do you think is wrong?"

  • 10 more comments 
  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    i cant drive it, does the car drive perfectly , cuise off, Y/n if yes then you have a bad cruise acutator. its sticking, if true that can be fixed 2 ways, repace the actuator or , clean and relube the parts so they dont stick. some cars have 3 cables, throttle, Tranny kick down, and Cruise. any can stick. all cables can. and for sure rusty. that is there "THING" bad return spings? best if car runs perfect , then remove the cruise acutuator and inpect it, that is what i do first. inspection, and feel the parts and the action, its not something to tell,, we do this all mech. parts,

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    i have no idea what is wrong, id have to touch it. and do simple tests, here is a link, with no rumors, (many think the brake switch is bad, no it is not, it has the oppoosite effect)

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    what has to be done is see if the servo sticks, if not, then it must be the controller going nuts/? or its inputs (its just a crude puter) see post 13 and 14. even a stuck CC accel button. The FSM covers all the tests , step by step.

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    and 1 more time ,did the brake pedal cancel the CC going nuts ?

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    it must , or its bad, the brake pedal switch.

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    as with all puter, bad inputs, bad actuator (ouputs) or bad controller.

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    the Puter is inside the PCM so is just software in the same.

  • _-__-___-_
    _-__-___-_ Mar 28, 2014

    the PCM is what watches speed, and brakes and sets the CC actuator .

  • pam sellers
    pam sellers Mar 28, 2014

    i can drive the car without a problem. break pedal totally cancels cruise control. i went to a mechanic but he cant say what is wrong with it.

  • _-__-___-_
    _-__-___-_ Mar 29, 2014

  • _-__-___-_
    _-__-___-_ Mar 29, 2014

    that is the schematic. of 96, and on a 96 cutting the wire is near impossible , they are shared, I dont have a cruise page, for your year. has it. log in get it. find a way to defeat the accel button. on this 96 they use resistance to tell the controller what you did, making diagnosis harder.



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When cruse is set, why does it not hold going down hill

Cruise control only maintains speed by utilizing the accelerator. To speed up it increases it and during slowing is removes it. The cruise control will not apply brakes in the event of a steep downhill run. In this case the vehicle will start to accelerate in the same manner as if the cruise control was not engaged. But in theses cases, most cruise controls, once the speed exceeds a certain amount above the set speed, will auto-disengage as a safety feature.

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Cruise control is a speed control system that maintains a desired vehicle speed under normal driving conditions at vehicle speeds above 40 km/h (25 mph). Steep grades may cause variations in the selected vehicle speeds.
The following are the main components of the Cruise Control System:
The powertrain control module (PCM)

The On/Off switch

The Resume/Accel switch

The Set/Coast switch

The TCC brake switch

The stop lamp switch

The throttle actuator control (TAC) motor

The vehicle speed sensor

Cruise Control Engaged
The cruise control system will engage and adjust the vehicle speed based on the activation of the following cruise control switches:



The cruise control switches are located on the multifunction/turn signal lever.
The powertrain control module (PCM) monitors the signal circuits of the cruise control switches in order to determine when to capture and maintain the selected vehicle speed. The PCM uses the throttle actuator control (TAC) module motor in order to control the vehicle speed. For further information on the TAC System, refer to Throttle Actuator Control (TAC) System Description in Engine Controls - 4.2 L.
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Cruise Control
Any given speed above approximately 22 mph (35 km/h) can be maintained with the cruise control by operating the lever.
-see photo

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To cancel the cruise control, briefly push lever to position 3.
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If the lever is briefly pushed to position 4 when driving at a speed exceeding approx. 22 mph (35 km/h), the vehicle resumes the speed which was set prior to the cancellation of the cruise control. The last memorized speed is canceled when the key in the steering lock is turned to position 1 or 0.
If the engine does not brake the vehicle sufficiently while driving on a downgrade, the speed you set on the cruise control may be exceeded and you may have to step on the brake pedal to slow down.
As soon as the grade eases, the cruise controlled speed will again be maintained as long as the brakes were not previously applied, or the lever may be used to resume the previously set speed if the brakes were applied.


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cruise controls are funny things
you have to accelerate to a speed then turn it on and press set
It will cruise at that speed
if you touch the brake it will unset and you will have to press on the accelerator again to the speed and pres resume
if you want to accelerate to pass just press the accelerator until you have passed , then just take your foot off the accelerator and it will coast until the set speed
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from your description of the problem , it appears that you have misread the instructions in the owners manual

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