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Jeep Grand Cherokee PCM

19 messages,  Last post on Sep 21, 2009 at 9:41 PM

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

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#16 of 19 Re: fault code 0320 [cherokeedave2] by 96jeep2 Aug 25, 2009 (12:05 pm)
Replying to: cherokeedave2 (Jun 27, 2009 6:03 pm) he i was able to replace mine, took about 30 mins but i got it done, but you prolaby been replaced already. post back you needs help
#17 of 19 Code#Po300 ? Ramden multiple missfire. 2000 Gran. Cherokee by dixiecsa Aug 26, 2009 (6:37 pm)
I have a 2000 Grand Cherokee Lorado, 4x4 4.7 L My Jeep has been giving me a Code Falt (Engine Light) # P0300 Random Missfire Didplug's. N.G. I Changed all the coil packs. N.G. I cleaned every plug in connecter under the hood with contact cleaner. N.G. I did a fuel rail test lbs. where good. All inj. where good. N.G. I Checked for vaccum, No leak's. Still N.G. Changed Temp. sensor. N.G. Jeep said there was a service bulliten came out, 1 down-load for driveability issuses, And 1 down-load for Tranny. Had them done. N.G. Then changed Cam Sensor & Crank Sensor. N.G. Don't forget every-Time I do one of these repair's, I clear the codes-engine light. And every time that DAMN P0300 Code Kept coming back.Any where between 2-3 days to a Month. Also since this problem My GAS MILEAGE HAS GONE TO ++++ in a hand basket. Know since I did the Cam & Crank Sensor there have been no codes for 1 Month. WAIT till Today A New Code... #P0601 (Check Sam Error) Witch means PCM Jeep want's $700.00 Reman can't get New. So I call around, Turns out NAPA has them 1 Yr. warranty. $121.90. Now it has to be Reflashed. I take it to Jeep they fash it, you know put some brains in it. Install it they road test it, All is well. Another $176.00 for Reflash. I Leave the Dealer Ship drive down the road to the Sunoco Station. Fill Her Up. Get in Start it up. I jot down the mileage so I can check th MPG out. And The Jeep Stalls !!!! I Turn it Over Nothing. No Spark you can here it, Just spining over like a TOP. Im madder then a Hound Dog with Flees. So here I am 40 miles from home 5:15 PM Jeep is Closed. I have no tool's. A Leather Man on my belt. I pop the hood, Take out the 2 10mm scews holding the rad. over flow tank. Pull it out unplug the 3 connecters on the PCM,Take my old PCM out of the box on the front seat. I fit down by the connecters and plug it in, It fires right up. The remann pcm is N.G. Mow I call Napa before they close at 6:00 They said sorry I'll order another. Have it in 2 days. I say wait a minuite, What about the $176.00 I just paid for the Reflash. They said they'll take to the company about it. So I pick a pizza some Coors Light.& go home. With the Idiot Light On Still. 1 YEAR LATER> Today is Wens. 26th let ya"ll know how I make out. I am hoping to change out the PCM & be DOWN. Or am I DREAMING. If I didn't lov this Dam jeep so much, I bought it 3 years ago fro the org. owner with 76,000 miles like mint new. The man littery only sat in the driverside, No Pass. No people, Never used the rear seat or cargo area. For 2 years it was great, But Chasing this problem is driving me nuts.
#18 of 19 1993 jeep grand cherokee no spark by mercyme6 Sep 20, 2009 (2:45 pm)
I am having same problems with my jeep,the check engine light does not come on when trying to start wants to start then doesnt no spark to coil or pcm took out tested coil it was bad, tested again after removing it tested good.,fuel pump is good but still no spark, ordered a pcm off ebay for $80 that came out of 93 grand cherokee same as mine but then talked to a mechanic and they said i hope it works or hope you got the right one because he said that there are different numbers and if they dont match it may not work is this right?i guess i just thought if it came out of the same year vehicle it would work.any suggestions on fuel, pump is not starting but fuel gage is good fuel pump was replaced no spark to coil.help Replies to this message: heydeno (Sep 21, 2009 9:41 pm)
#19 of 19 Re: 1993 jeep grand cherokee no spark [mercyme6] by heydeno Sep 21, 2009 (9:41 pm)
Replying to: mercyme6 (Sep 20, 2009 2:45 pm) They are right replacing the pcm it has to be set for the vehicle. When I ordered mine I still had to have it set they call it " Flash". On mine I think we found the problem. It was a shorted out fuel injector. When it shorted it would cause it to have no spark to the coil as well as have alot of other things go haywire. We replaced the fuel injector and it has not gave me any problems since. It has been about a month. So hopefull we did get the problem fixed. I am still keeping my fingers crossed though because it has been such a problem and costly.

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