Jeep steering

Asked by Sep 10, 2017 at 03:07 PM about the 2002 Jeep Grand Cherokee Limited 4WD

Question type: Maintenance & Repair

When cutting the wheel hard at a low
speed the steering wheel and front
shakes . Has did it since I got it

32 Answers

102,295

Mine started doing that until I serviced the differentials and transmission and transfer case, then it quit after about 15 miles. Make sure you use the Jeep Lubricants, I guess they are something special for the QDrive.

Ok thanks nice to no it's not just mine or something they all do regularly . Because I was thinking about buying a newer Jeep like 2007 but was kinda not wanting to because there quadra drive and I thought that the all time 4wd had to do with the wobble like all quadadrive Jeep's do it . I really don't like it.

102,295

After the service the only time I could make it do anything wierd was backing up with the steering all the way to the lock it would give a little jump in the front not much but you knew it did jump but that's all it ever did and any 4WD will do that.

Hello, I could use some help with my Jeep. it's idling kinda rough when stopped I think normal rpm idling is like 600. But mine idles at 600 then will go alittle up and then alittle down and keep floating around like that. An occasionally it drops to around 400 , I read that it could be (Pcm, spark plugs, IAC, Tps ,fuel injectors needing cleaned ) it does have 221k on it .

102,295

Start with the easy stuff first, so replace the spark plugs, PCV valve, the fuel and air filters, then clean the throttle body and IAC passages, use a scan tool to reset the computer and run the drive time protocol and see how you idle is then, if it still act weird then try running some seafoam in the fuel tank to help clean the injectors, if that fails then try a professional cleaning. If all the above doesn't work then you may have to go to a shop that can do live data scanning and see what the sensors and the computer are doing as far as setting the running parameters.

Thanks . I'm gonna run some fuel injector cleaner in it. The probably replace plugs. And I work at AutoZone so I can use our readers to reset the code .Also I do have a bad Pulley could it be that (Not sure whether it's idler or tensioner)

I would also like to remind you I have code p0601 for the Pcm . Is there a good chance it is that ?

102,295

That kind of information is very vital, it changes everything, forget about doing anything else until you have repalced the PCM. It will never run right until you do.

So you think that's what's causing it ?

102,295

You can check the Jeep forums and some of the other 4X4 forums and you will find that the code you have means repalce the computer, no if ands or buts about it. Now if it is all your problems that is hard to say, so of the rigs I have had to replace the computers on have come up with viable codes later on or during the drive time protocol the check engine light came on so its back to the shop to see what else is going on, usually it is just a sensor, nothing major.

Ok. Can I get a Pcm from a junk yard and then take it to dealer to program it and if so how much would it cost ?

102,295

In my area it runs a hundred bucks. What year is your Jeep? if it was made before 2004 it won't need programming as long as the numbers match on the replacement PCM.

2002 and I know but I don't want to have to dig through a bunch of Jeep's in the junk yard only to find out none of the match the part number

Is there a good chance that if I find a Jeep just like mine the pcms will match ? How many P/N are there for a 02 Jeep v8 Pcm

102,295

If you can find a Jeep that was built close to when yours was built you stand a better chance of finding the right numbers, there are a lot of PCM's with different calibration codes for altitude, state it was shipped too, engine size, etc. If all else fails you can try to have the numbers hotlined from your wrecker. another option is an R&R service, you take your broke PCM to a parts store, they send it out for repairs and the repaired unit is shipped back too the parts store for you to pickup. At one time there was some of those R&R services being advertised on E-Bay. HTH

Do you think it's possible that it's just normal for it to be doing this since it does have 221k

102,295

Things do wear out, but you have a definite problem with the PCM and that code, it precludes doing anything else until that has been rectified.

Ok thanks . Do you think that this rpm surge is just normal wear and tear for these miles and has nothing to do with it ? Have you have any experience with this sort of thing ?

I meant has nothing to do with the Pcm code

102,295

RPM surge is caused by 1 the computer trying to establish a base idle, 2 overcome an unmetered air leak, 3 an internal vacuum leak, 4 a failing TPS, 5 O2 sensors not switching properly. As your computer has lost some or most of its primary memory it's the first place to start.

Thank you I understand since the Pcm isn't storing most memory it doesn't really remember how to idle there for it's surging because it's try to find out how to idle because it can't remember because the Pcm is failing

Ok so I put Lucas injector cleaner in it about two days ago now it's only doing the rpm surge alittlw not anywhere near is bad . Does that indicate anything to you ?

102,295

Either bad fuel or the fuel system is really crudded up, but the idle will never settle, but if you can tolerate the way it runs then drive it till it fails, eventually the computer will give up and you will have to do something, who knows by that time you maybe ready to scrap it out.

I'd it possible the computer isn't causing this ? Maybe like you said injectors and stuff are really crudded up

102,295

Don't know, I've never had anyone continue to drive one when that code is present, don't know just how much it will compensate for memory loss. At least it resets back to factory presets so you can still drive it, just don't know how long it will keep it up.

What if I order a Pcm online from a creditable source & they program it to my vin and milage . Will I have to reprogram key also ? What about The Skim or whatever ?

102,295

The security system is not part of the PCM on your year so that should not affected. I have never heard of The Skim, so I don't know what that is. but if your talking about the ABS, that's also separate.

Apprenlty this is what skim is. I think i would need to get key reprogammed . ...When a Powertrain Control Module(PCM) is replaced on vehicles equipped with the Sentry Key Theft Deterrent System (SKIM), it must be initialized to properly function with the anti-theft module. This is accomplished at a Chrysler Group Dealer by using the DRBIII or StarSCAN Scan Tool to enter a PIN number

102,295

If yours has SKIM it will have to go to the dealer for reactivation. Not all Jeeps have it. You can call your local,dealer and give them the VIN and they can tell you if it has it or not. More on that subject can be found on the Jeep forums.

I belive it does, my has the grey key with fhe chip in it . So even if i replaced the pcm the i would still have to get The skim reactivated to my keys and to work with new pcm

102,295

You maybe able to delete this system with a new PCM by disconnecting the SKIM unit itself inside the steering column. Check it out online.

So iv noticed with the rpm surging that it gets alittle worse when it gets warm and also at stop lights how the idle goes down to like 300 if i put it in reverse or park then back itno drive idle retuns to normal around like 600

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