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Jeep Grand Cherokee Electrical Problems

711 messages,  Last post on Jun 12, 2013 at 9:33 PM

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

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

Messages Page 72 of 72

#702 of 711 Re: 2002 Jeep Cherokee [cooper2012] by watchdawg1

Mar 31, 2013 (2:39 am)

Replying to: cooper2012 (Jan 28, 2013 7:44 am)
Where do I find the cylinder head casting number? Silly question, "on the cylinder head , where else?" I just thought maybe you could dial me in a little better, but had to make fun of my own question. Thanks. Jim L

#703 of 711 Acceleration by gazorn

Mar 31, 2013 (11:10 am)

My first GC. The oxy sensor went out at 1000 miles. Now I have acceleration problems sporadically. I'm pushing the pedal but it doesn't go any faster until it takes off like it just found out that it has gas. Help please.

#705 of 711 Re: HERE IS WHAT I WENT THRU TOOK ME 3 DAYS [jpflum] by bretm

May 13, 2013 (2:57 pm)

Replying to: jpflum (Nov 17, 2008 7:30 am)
Sounds similar to my problem:
 
I have a 1999 Jeep Grand Cherokee 4.0 liter/6 cylinder that has 164 K miles. I've kept it in pretty good shape with tons of new parts over the past 3 years or so, and don't want to part with it. However, lately it's been getting horrible gas mileage (about 10 MPG highway), has been running roughly, and smells bad.
 
Finally took it to the dealer after several attempts by my local, independent shop. Dealer said that the car has been dripping oil down onto the ECU wiring harness for so long that the oil corroded the wires and harness plugs/sockets to the point that they are un-repairable. He said this harness is no longer made, and even if I could find one in a junk yard, it would be "pure luck" to be able to use it and have it work.
 
His solution? Buy a new car, mine wasn't worth fixing. Would cost several thousand dollars, more than the car is worth.
 
Actually, the guy sounded sincere, like he really was trying to save me a ton of money and hassle on a difficult problem that did not have much chance of success.
 
But what do YOU think? Can motor oil really corrode wires and sockets, or just gum them up? Can't this thing just be cleaned really good with an electronics degreaser spray?
 
Any tips appreciated...

#706 of 711 Re: HERE IS WHAT I WENT THRU TOOK ME 3 DAYS [bretm] by barryz

May 13, 2013 (5:18 pm)

Replying to: bretm (May 13, 2013 2:57 pm)
I would do research at parts stores and online parts sources, i can't believe you can't order a new wiring harness, sounds like the dealer service guy earns a referral fee if you buy a new jeep thats bigger than his fee for fixing, plus if there is a harness it will be cheaper to replace at an independent shop. Does not sound like a valid answer. If you want to try cleaning, get some electronic contact cleaner spray, take connectors off ecm computer located under hood on firewall passenger side, spray connectors and put back on, then unhook any sensors you can can reach on engine and spray connectors, look for pins on connectors that are pushed back and push them back in, make sure they lock in place. If you see any ground wires under hood that ground to body or firewall, take them off and sand the paint off where they mount to body, spray ground lugs with the contact cleaner. This could fix a lot of issues, i have a 99 grand cherokee laredo 4x4 with 172,000. I doubt its this, but battery gage if you have one on dash should read higher than 13.5 volts, if its lower, replace battery if its been a while, weak battery will not let computer function properly, i had this in past. Loosen battery cables and clean posts and terminals with wire brush if corroded, spray some contact cleaner there also. I would not clean harness itself if it has oil on it, its not a factor, bunch of bs, but connector contacts can have poor connection due to corrosion due to age, and can be cleaned as i explained. If none of this cheap stuff works, find a good independent mechanic that specializes in electrical and computers, he should be able to get a harness if needed, but could be a sensor, make sure the mechanic shop has the proper computer diagnostics equipment for jeep. It would not surprise me if just cleaning connections fixes. Let me know if you fixed.

#707 of 711 Re: HERE IS WHAT I WENT THRU TOOK ME 3 DAYS [barryz] by bretm

May 15, 2013 (12:06 pm)

Replying to: barryz (May 13, 2013 5:18 pm)
Thanks for your thoughtful, detailed reply! I'll give these suggestions a shot and find out...

#708 of 711 Re: ONE CATASTROPHE AFTER ANOTHER #2 [karma90] by jgc92

May 20, 2013 (5:24 pm)

Replying to: karma90 (Mar 18, 2013 12:38 am)
I had this exact same problem with my 97 jeep grand Cherokee. Driving down the rd it would just shut off. Is your check engine light on? Mine was on, and I thought it was my alternator too. I felt kinda silly when m mechanic tightened the serpentine belt and replaced the battery. I never had a problem again. My check engine light, which was on for years, has been off ever since. Hope this helps.

#709 of 711 2001 Grand Cherokee alarm and door problem by dmagi

Jun 12, 2013 (4:04 pm)

I'm experiencing 2 problems that have surfaced at the same time. Thus, I believe they are connected.
 
When driving, my overhead monitor chimes, illuminates the interior lights and says "Left Rear Door Open". Of course it is not, but it keeps coming on and going off.
 
Also, now my alarm keeps going off intermittently (and ohh to often). Haven't had a good night's sleep in a while.
 
I've taken it to the dealer, who said I needed a new rear left door latch, but would no guarantee that would fix the problem. Latch replaced, problem persist.
 
I'm at a loss for what to do next. Does anyone know what the cause could be, or a solution?

#710 of 711 Re: 2001 Grand Cherokee alarm and door problem [dmagi] by karma90

Jun 12, 2013 (8:14 pm)

Replying to: dmagi (Jun 12, 2013 4:04 pm)
I HAVE A 1997 JEEP GRAND CHEROKEE LAREDO. I EXPERIENCED THE SAME ISSUE A FEW MONTHS AGO. IF YOUR ALARM IS CONNECTED TO YOUR POWER LOCKS, THEN IT MOST LIKELY MEANS THAT YOUR REAR DOOR LOCK NEEDS TO BE REPLACED. FOR ME IT WAS MY PASSENGER DOOR. AFTER IT WAS REPLACED, I HAD NO PROBLEM WITH THAT ISSUE.
 
HOPE THIS HELPS.

#711 of 711 Re: 2001 Grand Cherokee alarm and door problem [dmagi] by barryz

Jun 12, 2013 (9:33 pm)

Replying to: dmagi (Jun 12, 2013 4:04 pm)
A very common failure that can cause all kind of power lock, alarm, power window, and interior light issues is that inside the drivers door, in the wiring harness that runs in door from the power lock/window harness is that there is a big, thick, copper back ground wire that grounds windows, locks, alarm, interior lights, to a body ground. this wiring harness passes thru door into car thru a grommet in forward side of door. If you can loosen the interior panel of door low by hinged side you will see this harness, and where it exits door. The common problem is this big fat black ground wire is not so much twisted wires but a round solid piece of copper, and repeated opening and closing of door have caused it to snap in 2 just inside the door or on the outside where it passes into vehicle. I could not visually see the break till i stuck my hand under the loosened interior panel and felt around this biggest fattest wire. i found it was broken in 2, but still making contact with a tiny corner which did not provide a large enough ground path. I was able to very gently strip the insulation of each side of the broken wire and use a twist on wire terminal to join the 2 pieces together, all problems fixed. Its been 2 years now, no more problems. I think if you take to a mechanic to fix, most not so honest, will replace a motor, lock, switch, charge you for parts and labor and repair the ground wire without telling you that was problem, as its only about 30 minutes labor, so the real cause is kept from you so you will thank them for fixing things that weren't broken and were much more profitable for them.

Messages Page 72 of 72

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