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Jeep Grand Cherokee Electrical Problems



  • john448john448 Posts: 2
    edited May 2010
    Hi there

    thanks for your reply and checked ebay and you are right there are multiple available. My only problem is that I'm looking for a Australian version (i.e right hand drive vehicle) and there are non available as far as I can see.

    Any suggestions where I can look for this item


  • sexy14mesexy14me Posts: 1
    My 01JGC check engine Has been on a while w/no prob. till now. I get maybe 12 MPG & beeps and says turn signal on while going down road. Any ideas ANYONE??
  • joe3djoe3d Posts: 22
    I had the same problem with my 2005 JGC today. All the lights on the dashboard illuminate for about 5 seconds while driving. Then they go away. It happened about 10 times while highway driving for about 90 minutes. The engine NEVER hesitated so it seems electrical just don't know what it could be? Any ideas? Thanks, Joe
  • barryzbarryz Posts: 43
    This sounds very similar to what mine did. All lights on dash came on while driving as if they were displaying like when you first turn key on. Some went out on their own, some stayed on till i pulled over, turned off jeep, then back on and they were ok. What I had observed was that the voltage gauge was pointing to the low side, although still within the good hash marks, apparently it was putting out about 12.5 vdc which i found out is low, a good battery puts out 14-14.5 vdc under load. Go to auto zone or sears, let them test battery. I was puzzled about the lights coming on, but since it was not preventing me from driving i ignored, then one day, when i had driven about 50 miles, went into a store, came out, jeep would not crank, called auto club and they came, tested battery, it was dead, replaced battery, no more problems, now volt gauge was higher also. I have since found out from posts on this board that the computer system of this jeep starts acting up when battery gets low, and while it may still start vehicle for a few more weeks its a sign of weak battery, it confuses the sensor readings and computer outputs, so check battery and if its not putting out around 14vdc, but closer to 12 under load(with engine on, ac on, lights on) replace. Please post results so we can all learn.
  • dj_moversdj_movers Posts: 15

    The best post on this topic that I have seen is #297: multiple loose grounds behind the dashboard.


  • joe3djoe3d Posts: 22
    dj, thanks for the heads-up on the post. I will certainly have them look at the grounds behind dashboard. It is worth a look. I also brought the jeep and had the battery tested at a local place on Monday. The said the battery was good at 12.86 volts. However, Jeep told me today I should still change the battery because they prefer voltage closer to 14V and since it is 5 years old it couldn't hurt to take a proactive approach. One of the other posts recommended a battery change also. I am going to do both. Change the battery and have the mechanic look at the grounds. Hopefully. that works. Thanks again. Joe D
  • joe3djoe3d Posts: 22
    Thanks for the reply. I had the battery tested Mon. I was all set to have it changed but the local battery shop said it was still good at 12.86volts. The battery is 5 years old. However, I called Jeep today and they said they rather have it at 14 volts and I should take a preoactive measure and change it anyway. After reading your post and others I will change the battery tomorrow and next week have my mechanic check for loose grounds. I will keep you posted. Thanks. Joe
  • dj_moversdj_movers Posts: 15
    Hi Joe3d,

    FYI-My battery is brand new...


  • joe3djoe3d Posts: 22
    It hasn't happened again since the original incident on May 30th. I changed the battery 3 days later and had the Jeep mechanic check it last Friday. They checked it for faults and didn't find anything wrong. Waiting to see if it happens again. I'll let you know if it does. Thanks, Joe D
  • dj_moversdj_movers Posts: 15

    Good to hear. I hope that continues to work for you. The ground post issue sounds much harder to physical get access to. I haven't had any additional occurences yet, but I do not drive much.


  • barryzbarryz Posts: 43
    Please all people who suspect computer issues, do yourself a favor and if your battery is only holding 13vdc or less do not let anyone tell you your battery is good, a good battery is closer to 14vdc and this is where the computer will work best, this was my experience and many others going back years on this particular forum.
  • toddb2005toddb2005 Posts: 1
    I have read several posts, where others have had the same problem i have on a 2005 JGC, guages fluttering, seat belt dash light on, headlights flashing, stalling twice, radio changing stations, etc. I have not seen a posting of a resolution. The dealer says its the BCM, but they want 1200.00. Any help would be appreciated.
  • mwatk025mwatk025 Posts: 3
    I own a 2002 Jeep Grand Cherokee w/ 4.0 6 cyclinder engine. Similar problems posted by others with electrical problems.

    Car seems to have a mind of its own. When the car is started, occassionally it will stall out within seconds after starting. Other times it will start right up. However, once it's running the gauges can go crazy, odometer and speedo. The Battery, gas, and oil gauges will die when other electronics are turned on such as the lights, ac, or radio. Or upon turning other things things will turn off. Also, the AC never seems to be kicking on. The lights are dim, sometimes the mileage indicator will turn off. Immobilizer light, Airbag, and other warning lights will turn on. Not sure what the problem is, but I can say the CPS sensor has been replaced, the wires running through the driver door are intact and good. I'm trying to narrow down what the problem could be and any help would be appreciated.

    The problem is intermittent. Has been happening every few months for the last two years, but goes away on its own after a few weeks, leading me to believe there is an exposed wire somewhere.

    Also, here is a link to a youtube video of my problem, take a look:
  • dj_moversdj_movers Posts: 15

    I have the same problem, but no solution. The best post I have read that makes sense to me as an electrical engineer is #297: multiple loose grounds behind the dashboard.

    My JGC is '06 with 48k miles. I will sell it before I replace the BCM. These issues happen very infrequently.

  • topat46topat46 Posts: 20
    How old is your battery? Even though it may have 12 volts does not mean it's good for your jeep. I notice in the youtube clip the voltage on your dash reads close to 12 volts. I have a 2004 GC Lmt. It started acting up in its performance. The battery showed 12 volts. I replaced it with a diehard gold and had no further problems. It needs close to 13.5 and over. If the battery is aged, change it. I hope this works for you as it did for me.
  • mwatk025mwatk025 Posts: 3
    Changed the battery within hours of taping that video. It's Brand new and now reads much closer to 14.
  • barryzbarryz Posts: 43
    Did the battery fix your problem?
  • barryzbarryz Posts: 43
    Ok, read your original post better, its been happening for 2 years intermittently, so you don't know yet if battery fixed. It may not have been battery, as 2 years ago it was probably still good, but you are asking for problems with the low battery you had, so 5 year old battery that was low was ready to be replaced. Do you happen to recall if battery gauge was close to 12vdc 2 years ago? It could have been since it was already 3 years old, but seems strange it made it 2 more years. Also in your video, lots of strange things happened after you turned engine off, that was probably the low battery not powering relays and sensors correctly. The battery should fix that, but just worry about things that happen with engine on and driving or at initial start up. My low batt caused warning lights at start up to not extinguish, also come on during drive, and gauges went crazy at start up. Then one day the car would not crank, no lights, etc, called AAA, they came and tested battery, it was at 12vdc which i was informed was not enough juice to turn on computer which would let other things work, he put new batt, and 99 6cyl laredo has been fine ever since, i hope that fixes you, post back in a month if you see better results.
  • mwatk025mwatk025 Posts: 3
    I can't recall where the battery was reading was two years ago, but since replacing it the gauge has been reading right at 14vdc. I mentioned that the problem was intermittent, I meant that it happens and will stay consistent for a few weeks and then one day i'll go out to my car and it'll just start running w/out any problems. It's currently in one of those states where it'll turn on but a/c is not engaging, or when you turn on one thing, another will shut off, or all the gauges will shut off. In the next week or two i'm going to bring it to a recommended electrical specialist and see what the diagnosis is. I'll keep you posted of any changes. Thanks for the help.
  • barryzbarryz Posts: 43
    edited June 2010
    A/C not engaging? It won't engage if r134 is low, if you have never added to a 2002 it may be just a little low, they sell cans of r134 at any auto parts store, with a gauge built into dispenser. If not turning on at all you may need to add a whole can or more. I got a good deal at BJ's warehouse club, 2 of the bigger cans for 25 bucks, thats almost half price to walmart where 1 big can is close to 20. I have had a slow leak for over a year. Last summer a large can could get me 3-4 months of constantly weekly check and top off, this year leak is faster i may need to let a specialist find the leak. Anyhow, if you are very low, as you add, gauge of can will appear to be cycling over pressure then down to zero and back up, ignore that, keep filling to it levels out, you will hear compressor engage as pressure corrects to good level and fill to correct spot on gauge. Last year i was able to slow down my leak by using a can of heavy duty sealer that can do more than just refresh rubber gaskets, can help seal metal leaks, that did not completely fix but got leak much slower, this year my first can was the one that also has ac oil in it, i figured i must be low with a constant leak, that can leaked quickly and another big can was needed to fill up again, as i said i will probably have to take it in to repair, hope its only a bad hose and not something else, i tried leak detector and uv light, but did not find leak.
  • joe3djoe3d Posts: 22
    My battery was original from Aug of 2005 GCJ. Almost 5 years so I had it changed. So far nop problems in the last week.
  • ggreen3ggreen3 Posts: 2
    I am new to this forum, but if this message gets posted, I just wanted to thank Mickyb1 because I also found a broken wire that had made all my windows go dead at the same time... It was an easy fix, just hard to find since no fuse or circuit breaker relay was broken. Thanks...
  • kman22kman22 Posts: 2
    any idea how to fix a liftgate lock? It does not unlock from the fob or the lock switch. Only way it so climb back there and mannually flick the lever inside the liftgate panel.

    do i need to replace the entire lock?

    thanks -
  • while driving i hit bump and car just die and would not start

    car cranks but wont start just change all the sparks wire
    out of wich 3 had no continuity, we have power before the coil and
    at the entrance of the distributor what should i be checking for
    this is my transportation to work any help will be much appriciated
  • tomficcatomficca Posts: 1
    My 04 has the dreaded window malfunction.I have done all the testing to check for a bad or brocken ground in the door jamb and foud it to be OK. What is left to check or replace? HELP!!!!!
  • pureh21pureh21 Posts: 1
    My 04 grand cherokee has some issues i need help with please!!!!!! The door locks quit working on the drivers side door the remote still works and now all of the sudden the windows will not work and the dome light remians on as i drive. when i got in my car this morning half of the programmed raido stations were not there anymore either. If anyone could offer some advice or maybe a solution it would be greatly appreciated.
  • did u get the problem solved Iam having the same problem any ideas thanks ed
  • camoman7camoman7 Posts: 4
    i have a 2003 jeep grand cherokee laredo,the cooling fan fails to work when it should. i replaced the motor and the relay located under the head light but still fails to kick on every time it should,i'm not sure what activates relay.
  • rutangrutang Posts: 2
    I have this same problem. Driver side door - no power windows, mirror, or locks. Passenger door locks work, no windows. Rear windows don't work.
    Here's what I did:

    Open the driver door. In between the door and the car there is a black flexible "boot" that covers the wires that connect the power windows, locks, mirror to the body of the car. Take that boot off. There are wires of every color. Look for a broken wire. Mine was the black wire, which is the ground wire. If I connect the 2 broken ends, together, the power windows, locks, mirrors work, and the dome light turns off when the door is closed.

    I bought a connector, and a wire stripper. Just need to connect the 2 ends of the wire, and all should be good.
  • barryzbarryz Posts: 43
    edited July 2010
    Before you replaced relay did you have a check engine light? I did when my relay went bad, by checking the code by turning key on-off the correct amount to display code it gave me code for fan relay- i replaced and it fixed. I also changed the fuse in the under hood box, as it blew open. my fan relay first went bad by being stuck on all the time, after engine was off it ran till it killed battery, then when i jumpstarted a few hours later when i discovered it, i had a check engine light, a blown fuse, and bad relay which never let the fan come on again. I first just replaced the fuses, there are 2 in box related to relay and fan. that did not fix till i replaced relay, which i had a mechanic do. There is a temp sensor which sends a signal to computer which then lets the relay go on or off, i am not sure where this particular sensor signal comes from, and i would be guessing to say maybe the sensor is bad and not sending signal to computer. Do you have a check engine light? Here is how to retrieve code, and a link which gives a list of codes.

    Retrieving codes:

    Turn the ignition key until the digital odometer displays, repeat three times in succession and then back to "On" (On/Off, On/Off, On/Off, On). At the fourth "On" the odometer will be replaced with codes. If no codes are present then "Done" will appear.
    do not turn key far enough on to start jeep, only to on position that lets odometer light.
    If no check engine light, probably no code, not every malfunction will leave a code, but when my relay broke it did light light and give me code p1491 which was relay, there are codes on list for sensors, so if you have a check engine light this might help.
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