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Jeep Grand Cherokee Electrical Problems



  • What year is your Jeep. My 2003 Grand Cherokee Laredo is having so many problems that come and go. Right now no A/C (not low on freon), somedays it shifts to Overdrive somedays not, all O2 sensors faulted at the same time, leak detector code P0456(even after replacing the pumps and hoses). One day the overhead console said it was -44 degrees and recently it said 105 degrees but I live in Brussels Belgium and 105 is not possible. It's always quite entertaining to watch but hell to drive.
  • You are Certainly having problems for a car only 9 years old. I got my Jeep in 1994 and have spent maybe $6000 in 20 years in repairs and I have only 78000 miles on the vehicle
    My Antenna won't go up or down automatically so I do it manually,
    I cannot shift to LO and don't know why, so I have some problems too but not as frequent and erratic as yourse seem to be. Good luck.
  • Hi,

    I hope your still one here I realise it's an old post. I have exactly the same problem. All fuses and bulbs are ok.

    What was the fix in the end ?
  • Hello,

    I have a 2005 Jeep Grand Cherokee (4x4 5.7 Hemi) and until yesterday I had no problems.

    I went to leave and when I put in the key to turn the Jeep on, all (or at least most) of the warning lights came on and several 'service system' messages were displayed.

    The Jeep would not start, but the radios, head lights, interior lights, AC/Heat, Fan/blower, horn, wipers, etc. all work.

    When I turn the key it makes the same grinding sound that would be made if the car was already on and you tried to continue turning the key.

    Does anyone know why this happened?

    Does anyone know what I can try to fix this?

    If it won't run I'll have to get it towed and that could take some time and would just cost more money.

    Thanks for any and all suggestions.
  • We had the same problem.
    Have them replace the ignition switch.
  • lobo18lobo18 Posts: 1
    We have the same symptoms, and others:

    When you push on the start button, it will turn over but not start the you have to hit the button again to try and stop this, the work around for a day or two was remote start the car.

    After taking the car in for service, they said it needed TIPM but it is on back order for 3 weeks! the dealer said it was safe to drive....not so...the car stalled in traffic, now my wife is afraid to drive the car, she how wants to trade it in but not for a jeep!
    we are shopping now.
  • PCM
    remove rad reservoir, three screws (simple)
    remove PCM shield (simple)
    disconnect three links to wiring harness (carefully)
    see two chrome screws, back off two turns (simple)
    reconnect wiring harness (carefully)
    start vehicle (test)
    90% of time will correct problem (simple)
    if correct, replace installed 1/2" screws w/ 1/4" or stand off w/washer (simple)
    replace wiring harness plugs (carefully)
    replace PCM shield (simple)
    problem corrected!
  • Dont get me wrong. Im no mechanic or anything like it. But it sounds lije u have an electrical issue. I only say that because i have a 99 Grand Cherokee limited and I found that I as well had an electrical problem. And as simple as this sounds......try unhooking the battery. It fixed my window problem when all my windows stop working at once.
  • I haven't been able to get it fixed yet but for a month almost I have had this problem as well..started out with the radio going off and coming back on and the abs warning light coming on and right back off when I would hit bumps or drive down an extremely bumpy road but while trying to find out where the short was it died in the middle of the road. It turns out it is the ground wire. I don't know what the fix is yet because haven't been able to get it looked at but I do know it is the cause so yea you should get that checked out. Found the problem when a friend wiggle the ground wire and the power was restored

  • And then same thing happened again and this morning too so I barely touched the ground wire and got power back

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