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Jeep Grand Cherokee PCM Module Replacement

159 messages,  Last post on Aug 04, 2012 at 2:30 AM

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

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

Messages Page 16 of 17

#146 of 159 Re: She LIVES!!!! [steve_] by rgarmon

May 05, 2011 (3:22 pm)

Replying to: steve_ (Mar 25, 2008 12:53 pm)
Hopefully you are still on this site. I have major problems with my 2001 JEEP Grand Cherokee. It first started a few months ago while driving, the JEEP would jolt as though it was trying to cut off. After a month of that it did start cutting off while driving and at stop signs/lights. I would have to put the car into neutral and restart- while driving!!! After about 2 months of this it would not start easily, or it would start and cut off within 10 seconds. After this it totally died and I had to replace the battery. So, after I replaced the battery the JEEP started, but still with the same problems listed above. Additionally, there are other things going on that I believe are related: the speedometer fluctuates up and down, the digital gas reading fluctuates- it will say 100 miles to empty then 0 miles to empty then 24 miles to empty and so on. Not sure if these are all related. Additionally, I had the altinator tested and it was 13.5 (kind of low).
 
The dealership ran diagnostics, but couldn't get a reading because they said "it would fix itself and no codes would come up."
 
Now they are telling me to replace the PCM. They want $900 total! I have already put so much into this JEEP to no avail. After reading some of these posts I am wondering if it may just be a coil? Please help. I need to know what questions to ask these jokers- like did they test for spark??? Please give me some ideas and maybe a list of questions to ask the dealer to see what they did to determine that it is the PCM.
 
Thanks!!!

#147 of 159 Re: PCM Module Replacement [cgsanford] by rgarmon

May 05, 2011 (3:27 pm)

Replying to: cgsanford (Dec 24, 2007 3:28 am)
Hi
 
Please tell me what sensor you had replaced???
 
Hopefully you are still on this site. I have major problems with my 2001 JEEP Grand Cherokee. It first started a few months ago while driving, the JEEP would jolt as though it was trying to cut off. After a month of that it did start cutting off while driving and at stop signs/lights. I would have to put the car into neutral and restart- while driving!!! After about 2 months of this it would not start easily, or it would start and cut off within 10 seconds. After this it totally died and I had to replace the battery. So, after I replaced the battery the JEEP started, but still with the same problems listed above. Additionally, there are other things going on that I believe are related: the speedometer fluctuates up and down, the digital gas reading fluctuates- it will say 100 miles to empty then 0 miles to empty then 24 miles to empty and so on. Not sure if these are all related. Additionally, I had the altinator tested and it was 13.5 (kind of low).
 
The dealership ran diagnostics, but couldn't get a reading because they said "it would fix itself and no codes would come up."
 
Now they are telling me to replace the PCM. They want $900 total! I have already put so much into this JEEP to no avail. After reading some of these posts I am wondering if it may just be a coil? Please help. I need to know what questions to ask these jokers- like did they test for spark??? Please give me some ideas and maybe a list of questions to ask the dealer to see what they did to determine that it is the PCM.
 
Thanks!!!

#148 of 159 Re: She LIVES!!!! [rgarmon] by steve_ HOST

May 05, 2011 (5:17 pm)

Replying to: rgarmon (May 05, 2011 3:22 pm)
I'm here. But fortunately for you, lots of people with experience fixing Jeeps are here too.
 
Checking the battery connections everywhere, including the firewall or wherever they terminate may help. But I'm no mechanic.

#149 of 159 First and last for me...unfortunate by grizz4

Jul 11, 2011 (5:51 pm)

Bought a used ( around 53,000K) 2005 Jeep Grand Cherokeeoff at a lot, have just over a 100k on it now and had nothing but problems. Everything from hard downshift at around 40kmh (have had transmission flashed twice now), wiring failing to rear passenger side window, rear seal on driver side leaking and now the lights, dash and (rear included as are trailer plug) are flickering and acting "possesed". Very obvious this vehicle has many flaws that are common to all of this year and more...yet the buyer of them has to foot the bill instead of a "Great" north american vehicle manufacturer stepping up and admitting problems and fixing them as a responsible manufacturer should....warranty or not. For the money this vehicle was brand new on lot ( just over $45k) and only being 6 years old I am blown away by the "North American Heep" it is...is it any wonder why people buy import?? And I have spent thousands more on this vehicle then I did on my Mazda MPV (2003) which I retired only because I had put over 200k on it and the only thing other than regular maintenance (brakes, engine oil and transmission oil service) that needed done in that time was a repack of a front wheel hub! Sorry Chrysler/Jeep I will never buy another and I love telling people about my 2005 "Heep"!! If I detour one purchase of this vehicle I will be a much happier man...but honestly I think it may be more

#150 of 159 Re: PCM Module Out of Stock [jgcguy77] by scottconrad

Jul 18, 2011 (3:21 pm)

Replying to: jgcguy77 (Apr 14, 2011 3:53 pm)
my wife's jeep just suddenly wont start. has juice but no spark at coil replaced ignition coil and still no spark will replace module next after reading a lot of other problems i think its a short somewhere and bad pcm( whatever that is ) because we have speakers in the door that were installed after market and they hang on just by the wires and each one is different one is horizontal and the other vertical screwed in with drywall screws just want to know if that is a good answer to my problem (just need a little help(scottyac1hotmail.com)

#151 of 159 Re: PCM Module Replacement [rgarmon] by erm1974

Jul 24, 2011 (9:39 pm)

Replying to: rgarmon (May 05, 2011 3:27 pm)
the first part of your problem sounds like the crankshaft position sensor i was having the same problem and guess what..it's fairly easy to replace..the second check all the wiring on the drivers door for shorts for some reason when you short one of the wires on that door the gauges do that on most and check the relay under the drivers side dash over the fuse box it's not easy to get to but there are a few there and i'm not sure the correct on but a friend told me one of the relays go to the gauges and can cause that..good luck..hope anything helped..

#152 of 159 2001 JGCL Not starting by erm1974

Jul 24, 2011 (10:10 pm)

Hi Every one I could really use help.
My jeep is turning over great but wont start. One day my Girlfriend went to start it and it turned over Ok but the cells in the batt were kinda shot and it just did not want to start. I knew the batt was going so I replaced with new one and it turn over great and I'm waiting for it to start and nothing just turning over great. I went through the Haynes check list and went step by step and the only thing that I seem to have wrong so far is the wire harness going to the coil rail when you turn the key on position but not try to start it charges the line to 12.8 volts and then dies right back to zero.. The book said it should stay at the 12 volts and if not check the auto shutdown relay well I have looked and I can not find it I thought it was on the engine fuse block and then under the steering wheel located over the fuse box and none of those relays seem to go to the coil rail wire harness. Oh and if it matters the alarm was not working correct right after the batt was changed but seems to be working fine now. If any one has dealt with this or knows what to do or has another good reason I should be looking at something else I would be grateful for any thoughts you had or pointers I just cant afford to throw more money into this jeep and it's still has a loan on it so I could really use some help. Even catch me at my email. I don't care at this point burnzallmedia2k5yahoo.com subject Edmunds jeep help..Thanks every one..Will also check in here.

#153 of 159 Re: PCM Module Replacement [rgarmon] by bhunley

Aug 11, 2011 (5:31 pm)

Replying to: rgarmon (May 05, 2011 3:27 pm)
crank shaft sensor. i just had the same exact problem with mine. took forever to figure out because like yours it wasnt throwing off any codes

#154 of 159 Re: She LIVES!!!! [rgarmon] by nitronorm1

Sep 07, 2011 (9:09 pm)

Replying to: rgarmon (May 05, 2011 3:20 pm)
hey I hope this helps I had the same thing I feel you need to take the PCM out and send it to SIA to have it rebuilt they will find moisture in it and they will give it an update so the Jeep runs stronger Head office Florida and it will be sent to Tilden Ill. they did a great job for me the dealer I went to Demeyers in Simcoe ontario had no idea and charged me 900 bucks and I had to tow it home and fix it myself

#155 of 159 Re: She LIVES!!!! [nitronorm1] by vinetta

Dec 06, 2011 (3:43 am)

Replying to: nitronorm1 (Sep 07, 2011 9:09 pm)
what is sia

Messages Page 16 of 17

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