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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 1 of 4

#1 of 37 2000 JGC 4.0 6-cyl; PCM? by tbull15

Jan 23, 2008 (10:21 am)

I went out and started my Jeep up without problem. I then drove it about 30 miles and shut if off for about 3 hrs. Again, I went out and started it up without problem but the Abs, check engine and airbag lights were on. When i tried to drive it, I couldn't get over 20 mph with it floored and the gauges began to flicker. Pulled over, turned it off, started up and the same thing happened. Left it for the night, started it up again and it spit and sputtered terrible while the guages flashed on and off. It finally deseled out and stalled with a puff of smoke through the air-breather. Checked fuel pressure and fuel pump, both are fine. There are also no error codes. It is at the dealer now and they have ruled out mechanical failure; so now it must be electrical right? Could it be a sensor? or the PCM? Any ideas or help would be appreciated.

#2 of 37 Re: 2000 JGC 4.0 6-cyl; PCM? [tbull15] by everlastboi69

Jan 23, 2008 (10:03 pm)

Replying to: tbull15 (Jan 23, 2008 10:21 am)
Hi I was having the same problem with my 200 jeep grand cheerokee laredo. I keep taking to the dealer they couldnt figure out what it was. Lucky for me my father is a mechanic 2 hours from my house so one day the jeep was acting normal i drove to my dad he put the computer on the jeep and discover it was the Speed Out Put Sensor ... Guess what dot be fooled. this peice only cost me $16.00 us to fix granted the labor from my dad was free. have them check to see if that is the problem.Ever since mine was fixed it has been running, great ((KNOCK on WOOD)) Also Chysler Makes Jeep. If this happens to you pull the jeep safely off the road. Turn it off, and you must remove the key from the ignitian for 20 minutes. some models may take 25. the jeeps system will reset. so if signs of electrical or sensor problem this can temporarly fix. I realize trust me it dosent help when your in a hurry or on the exspress way. but it works if problem keeps continuing you need to fix it qiuck.

#3 of 37 4.7 ho engine by erwin2

Dec 14, 2008 (9:35 am)

Vehicle has been in for service three times for high idle problem when warm. the problem has started again. has anyonelse had the same problem

#4 of 37 fault code 0320 by cherokeedave2

Jun 27, 2009 (7:03 pm)

I just remembered how to check fault codes by turning key 3 times. It spit out code 0320 Crankshaft position sensor (CPS) I think I’m on the right track as this produces the pulse train to the PCM and injectors, purchased a new CPS from autozone for 60.00 along with replacement info. I was able to disconnect the connector from the left side of the eng. above the starter ohmed out pins B and C, should read infinite resistance mine read close to 0 ohms. HOWEVER, even though I have long arms I have big hands and can’t seem to find the nut let alone remove. If anyone has a method I would sure like to know, such as tools used, pics etc..or I’ll have to take it to a Dealer..OUCH Thanks

#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.

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