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Jeep Grand Cherokee PCM Module Replacement

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  • Did that too, still the same problem. Besides It just quit on the boat ramp and wouldnt start so I replaced the cap and rotor 2 times now one with the jeep oem and one with the schucks aftermarket. them I put the one that was on the car back on and still the same thing...3 bad rotors?
  • Hi
    I am reluctant to take my jeep into the dealer but have had no other choice. The jeep has a new battery for starters and cranks over, just does not start. The fuel gauge is not reading with the key in the on position. The dealer says they need 2-3 hours just to figure out what might be wrong. They are indicating maybe the PCM, TCM or the cluster.. they don't know. Currently he indicates he can't communicate with them. I have looked through a lot of information and it appears maybe the PCM is the problem. Two Questions
    Given the symptons does any one have any advice?
    Does any one know where to get a PCM other than the dealership that is legitimate and a decent price.
    Any help would be great thanks.
    Chris
  • Hi

    The pcm is gone on this 2000 GTC 4.0l and the dealer indicates a skim module is also required (sentry module key). Is this true or can you just replace the PCM after it has been programmed for the vehicle? No one seems to want to give this information out they just want the 1000.00 for the pieces. Any help is appreciated.

    Chris
  • lunghdlunghd Posts: 61
    Sentry module? OEM alarm system? Ask the dealer to fix THAT first & be sure to mention you have a 'SPARE' PCM ready & waiting so no need to put a new one in just yet... *(Unless it's a freebie under warranty!).

    The danged OEM (and aftermarket...) alarm systems have been known to go out & prevent starting.

    There's also the ever popular ignition switch (not the key unit - the electrical switch itself), there's an interlock / latch relay, the fuel pump (has ya got's pressure???), the Neutral safety switch (NSS)...

    Hmmm - NSS... Have you tried starting it while cycling thru the gears w/ your foot on the brake??? Just turn the key to start w/ one hand & use the other hand to go from Park to 1-2 & back up. (Keep yer foot on the brake!) The NSS, which is down below where the water from that boat launch was, could be full of water & gummed up. Fairly easy to remove & rebuild. (Article & 'how to' linkages on my website.) Crown Automotive online sells them for about $110, Don't even ask what the dealer charges...
  • Humm, Interesting thought. I never thought of a NSS before.Dosent the NSS keep the starter from working? It will crank over when use the key but I will try to see if it does when I run it in the gears? So if it continues to start while in gear should I replace the NSS at that point? What if the same thing continues? Is the factory alarm system integrated in the PCM? Because when I got another PCM from the bone yard they asked if it was a factory alarm..? all I know is it has the key card by my knees and when I pull it out it disables the starter. The horn doent beep or anything like that.

    Where is your website link? just in case I find the NSS to be the problem
  • I am seeing the same problem mine has no communication to my scanner also I have no gas gauge or volt meter woking with key on. I have had my pcm reconditioned and that did not make any difference. Mine died just driving down the road will post any more findings.
  • Listen i let the dealer look at got the story that they need 2-3 hours and it turned out to be the PCM. I have ordered one (New one) from a company in the states that takes your serial number, color of ignition key and programs it. I will be getting it this week and can let you know. I parked my jeep one night turned it off, next morning would not start. The symptons you are telling me are the exact same ones I had with the exception it did not die on the road. The dealer also said the scan tool would not communicate with the cluster, pcm, tpm .. thats why they wanted 2-3 hours.
  • dulyddulyd Posts: 2
    the voltage regulator is bad and it is located inside the pcm hurry and replace it before it quits. everdrive.com has them for cheap. :shades:
  • Well after checking over everything my crank position sensor was internally shorted causing a back feed the pcm causing a loss of communication to the scanner. I replaced sensor all is well.
  • Hi

    I tell you I did the exact same thing after the PCM did not correct the issue (as directed by my dealership which cost me 300.00 bucks to diagnose) and the sensor fixed everything. For all those folks out there that have a similiar problem, change the sensor first - its cheaper and likely the cause.
  • I had the same problems with my '97 Grand Cherokee, I did have the PCM replaced, I bought it from the dealer thinking that any mechanic could install it, I was wrong, only the dealer had the computer that programs it to your car. It helped somewhat, but still it starts sluggishly.
    Melissa
  • When you buy a new computer you just have to supply the serial number to your jeep and they can program. I live in Canada and ordered one from Florida for 280.00
    The crank position sensor solved all the problems and I didn't need a computer, the dealer was wrong. www.autotrans.com is where you can get reasonably priced parts.
  • I HAVE A 93 JEEP GRAND CHEROKEE, 5.2 ENG.... TO START MY JEEP I HAVE TO TURN THE KEY ON, AND DEPENDING ON HOW COLD IT IS OUTSIDE, I WAIT SOMETIME HALF AN HOUR, THEN I GET CLICKING COMING FROM MY FUEL PUMP RELAY AND AUTO SHUTDOWN RELAY FOR ABOUT 3 MIN, THEN MY CHECK ENGINE LIGHT COME ON, AND I CAN START MY JEEP, AND IT RUN FINE.... HAS ANYONE ELSE HAD THIS PROBLEM??
  • I have a 1997 jeep grand cherokee with a 6 cyl engine. the check enging light came on and when the code was checked it said "Direct battery input to PCM was disconnected within the last 50 key-on cycle. Does anyone know what this means. The engine still runs good. I unhooked the battery hoping that the light would go away. It's still on. Could a sensor be causing this?
  • rickeylee...pretty sure that's your pcm/ecu....the main computer. My '94 did the exact same things you described. You can buy a new or used unit or do what I did: I changed the 3 capacitors on the ecu and haven't had a problem in the 2 years since.
  • How the heck do you get to the crank position sensor on a 93 V-8 Grand Cherokee. Looked under and above and can not see it.
  • It located on the transmission close to where the tranny bolts on to the engine. If your looking at the front of the truck, it would be at the 1:00 oclock position.
  • tuggajbtuggajb Posts: 646
    have you disconected the battery for about 10 min to reset the computer to fac defaults? then hook back up and drive for a bit to store new parameters to sencers
  • weewee Posts: 3
    hello,

    i have 2001 jeep gran cheer and was having problems starting i did key trick and got code for crankshaft position sensor replaced and truck started.

    after replacing and starting,truck started running ruff and stalling.did key again and got codes p0351,p0352,p0353.ignition coil.

    changed ignition coil pack and code p0351 went away and p0352,p0353 are still there truck is idling ruff and still stalling code says dwell time not sure what to do if anyone with same problem or anyone who knows what to do please help trying to avoid dealer and costly unnessary inflated pricing for repair work.

    please help!!!!
  • Well I thought I would give an update to what I have learned so far. I had my PCM rebuilt/checked and after spending 200.00 it came back saying that the PCM was in great working shape. So then I decided to go ahead an replace the Cps(crankshaft Position sensor)thinking that might be the problem as well. Nope still wont start. I am so frustrated at this point I dont know what else to do? Should I spend the money and try the coil next? I cant belive that it wont start yet. ANY IDEAS would be great! Thankyou so much for any help that you could provide.
    Jeff
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