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Jeep Grand Cherokee PCM

37 messages,  Last post on Sep 30, 2012 at 7:59 PM

You are in the Jeep Cherokee and Jeep Grand Cherokee Forum.

What is this discussion about? Jeep Grand Cherokee, Jeep Grand Cherokee SRT-8, Electrical, SUV

Messages Page 2 of 5

#6 of 37 Jeep Grand cherokee 2002 by lawrence56

Jun 29, 2009 (9:02 am)

I have a weird electric problem no one can figure it out. Sometimes I try to open the door with the keyless button nothing happens. I open the door with key the dome lights don't go on, I try to start it the gauges spin around and won't start after two or three times it will finally start. I also found out if I open and close the driver door a few times the dome light goes on then it will start. I took it in and had the ignition switch and the pcm computer replaced. The Jeep is perfect other than this problem.
Does anybody have an answer?

#7 of 37 code PO351 by heydeno

Jul 05, 2009 (2:33 pm)

I have a 1996 Jeep Grand Cherokee 4wd I have been dealing with problems for about a month. It first started dyeing when i would sit at a light but it would start back up and was able to take off. Then it would on occasion not want to start it would crank and crank but not start if you shut the key off and waited then it would start. It seemed to happen more when the engine was cold. It has been scanned about 5 times always the PO351 code would come up. We thought it was the coil so we replaced it with a aftermarket coil a higher performance since there had been so many complaints about the plug problems on the old coils. It did nothing. When a fuel guage was put on my jeep it was jumping all over the place so they told me I needed a new one. Replaced that big $ still had the same problems. The distributor and pick up have been changed along with the crankshaft sensor I am thinking the only thing left is the pcm but that again is big $ and i am really frustrated at this point. Do the PCM's have to be programmed when you purchase them and does anyone have any different ideas? I cleaned all electrical plugs on the pcm and other items or could the crankshaft sensor still be bad even though it is a new one?

#8 of 37 Re: code PO351 [heydeno] by juan15

Jul 25, 2009 (5:40 pm)

Replying to: heydeno (Jul 05, 2009 2:33 pm)
they sell pre-programed pcm's for jeeps on ebay for between 150.00 and 200.00 hope this helps because i just paid Chrysler $1200.00( i wish i knew about the ones on Ebay) for the replacement of my pcm and its only been a month and i'm back to the same stalling and i get the key symbol. I 'll be taking my jeep back this week and hopefully they can get to the bottom of this.

#9 of 37 Re: code PO351 [juan15] by heydeno

Jul 26, 2009 (8:51 am)

Replying to: juan15 (Jul 25, 2009 5:40 pm)
thanks for your comment since i posted my comment i replaced the pcm and yes I still have the problem. It still looses spark at times. Everything has been replaced. So if you get anything new please let me know. I have thrown alot of money away and nothing has fixed it.

#10 of 37 AAAAAHHHHHHH by 96jeep2

Aug 16, 2009 (6:51 pm)

Looks like alot of us are having the same issue, anything from not starting all the way up to stalling while towing a boat 15 mins down the high way. This is absolutely absurd!!! I have changed everything in my car and I still can't get it started, maybee the goverment should have let Chrysler fall right on it's face, just like chrysler is letting their customers do. I dont think it's any of the sensor's, pumps, hose, fuse or switches ; I think it is the whole wiring harnes it self! It has to be, we replace every sensor, switch, hose, fuse, and the pcm! If we replaced everything its got to be what connects of of them together. Jeep is known for, not have a great electrical system to begin with. I dont know I am not a mechanic, but I do have a brain. Oh were was that brain of mine when I started this crap!! LOL any ways. I spent way to much money on this, At this point is would be foolish to give up. Any one know were I can get a new wiring harnes, that hopefully dose not coast an arm and a leg, i only have a few fingers left.

#11 of 37 Re: AAAAAHHHHHHH [96jeep2] by heydeno

Aug 17, 2009 (9:25 pm)

Replying to: 96jeep2 (Aug 16, 2009 6:51 pm)
I am at the same point as you. I was told it could be a intermittent injector problem. One that is shorting out which in turns operates the coil. I haven't done anything with it yet I have replaced everything on my jeep as well. It has cost a ton of money and nothing has fixed the problem. If you find out it is the wiring harnes will you let me know? I have no idea where to get one except from the dealer which will cost alot. If you get a used one you could get the same problem...

#12 of 37 tem gauge goes nuts by reone

Aug 23, 2009 (10:34 am)

have a 2003 grand cherokee 4.ol 82000 miles tem gauge goes back and forth from 100 to 260 replaced thermosat.coolant sensor /ground wires were clean /instrument cluster was change nothing seems to work for long when grounds were cleaned worked perfect for 3 days now seem thing.had it to garge when it was acting up although tem gauge was near 260 engine read 208 so it's not overheating.any ideas would be very helpful. garge now tell's me i need ECM computer

#13 of 37 Re: tem gauge goes nuts [reone] by heydeno

Aug 23, 2009 (11:41 am)

Replying to: reone (Aug 23, 2009 10:34 am)
That does sound like you have a shorted wire sonewhere. Finding it will be the problem. Mine will run good for days and then will mess up out of the blue. You never know when it is going to happen. Someday hopefully we will find the problem

#14 of 37 Re: tem gauge goes nuts [heydeno] by tuggajb

Aug 23, 2009 (2:07 pm)

Replying to: heydeno (Aug 23, 2009 11:41 am)
next time gage acts up just wiggle the key a little dont sutoff but just wiggle it a little see if takes care of prob if it dose then i would replace the ignition switch

#15 of 37 Re: AAAAAHHHHHHH [heydeno] by 96jeep2

Aug 23, 2009 (8:26 pm)

Replying to: heydeno (Aug 17, 2009 9:25 pm)
Yea I went to the dealership looking for a harness and it's basically a billion dollars, but I did find out that their are a few recall's one being with a certain pcm witch I happen to have so i dropped off my car and they are working on it i should hear back in a few days, oh by the way the pcm # is 56043172, the recall is for a erratic idle and intermitan loss of some light's gauges etc.... the pcm needs to be reconfiged not replaced, if you replace it you will still have the same problem, so they say..... till next time, hopes this helps and will let you now how i make out.

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