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Jeep Grand Cherokee Electrical Problems

208 messages,  Last post on Nov 23, 2009 at 9:03 AM

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#144 of 208 1994 Grand Cherokee - electrical issue with transmission? by danwiz Jun 09, 2009 (11:29 am)
have a 1994 Grand Cherokee limited with a transmission that stopped engaging. On day it just stopped at a red light and wouldn't move. I changed the filter and fluid and it began to do the following: When starting out, it will not immediately move, as if it is not in gear. After applying the throttle up to around 3000 rpm, it will lurch into gear and leap forward. It has the same issue going from 1st to second gear, and then seems normal second into third. When it hits fourth gear it will randomly downshift back to third, then up to fourth. When coming off a highway, the transmission does not appear to downshift at all, vibrating violently and then stalling when you come to a stop. It sometimes does this vibrating act when you first start it as well. I brought it to my mechanic, who recommended a transmission shop. He put on an aftermarket oil cooler, and recommended a junkyard transmission. The battery was not holding a charge, so I had a new one plus an alternator put in as well. Nothing changed with the different transmission, so we tried a second used transmission and that did not change the symptoms either. In the end he rebuilt the lower end of the original transmission, which did not change anything either. He finally gave it back to me (no charge except for the battery and alternator) and told me it was an electrical problem, not a transmission problem. My mechanic replaced the speed sensor and governor sensor but that did not change anything either. (He did not charge me.) Does anyone have any ideas? It's got 182K and the 4.0. The transmission is the all-the-time 4-wheel drive. What I'm getting from most people is "hey, it's a Dodge with high miles, why fix it." Any help would be appreciated.
#145 of 208 96 Grand Cherokee DIED Suddenly by agreenfield Jun 10, 2009 (6:03 pm)
So, my boyfriend and I went 4 wheeling in tall grass in his 96 Jeep Grand Cherokee Lardeo 4.0, I know, NOT a good idea. The next morning we left to drive about four hours and forgot to check the undercarriage, REALLY not a good idea. We were about 2 hrs in and the transmission started slipping on the highway at about 70 mph. We stopped for gas, it started up fine, and on we went. Transmission was acting up over 70, but seemed fine at 65. He told me to pull off so we could check the fluid, I exited, turned left, and the Jeep died at about 45 mph. Just shut down, no gauges working at all. Cranked but would not turn over, but you can hear the fuel pump come on. We looked under and found grass around the drive shaft that had ripped out the downstream O2 sensor. Of course it was late, no parts stores were open, and we left the repair manual at home... He tried to stick the wires back in the sensor but that didn't work. We got towed home, replaced the sensor, and nothing changed. Checked for fire at spark plug, nothing. We tried to get the check engine light to flash the codes manually, and that didn't work either. No check engine light at all. We went to checking sensors with the volt meter, trying to make the check engine light come on. Nada. Very low (about half of normal) readings on major sensors. We had it towed to a shop, they said it was reading crazy and must be the PCM. We have tried two different ones programmed for the vehicle and they didn't change a thing... Still cranks, no start, no gauges, any ideas? Thanks so much!
#146 of 208 2000 JGC stalling at stop and driving by ryanproject Jun 17, 2009 (6:39 pm)
kills and starts back up. some times right away some times in a min. or two. one time gauges went crazy. put out code for tps   from my reading on this site, i see it is a common problem and we know why they are bankrupt. i have a list of possible suspects,   -Battery -TPS -Crank Sensor -cpu,ecu, computer, -maybe alarm, some unplug factory alarm    it kills every 100-300 miles and i have 100k mi   my understanding is the computer is sensitive, and puts out a false TPS and Crank code. I changed battery and TPS, still died. The comp put out a Crank Shaft Code. I am going to change that then try a new computer from ebay,   It did not show a code at autozone but i turned the key three times without starting and it read p0306. it will flash code. if no code it will flash done.   Other than that great truck WILL SELL
#147 of 208 Strange array of problems by virgil373 Jun 25, 2009 (6:39 am)
About ten days ago I noticed my 1999 Jeep Grand Cherokee Laredo, 6cyl, 4x4 was leaking radiator fluid. Took it to the shop, they replaced the water pump and also said the cooling fan relay was broken and replaced it. A couple of days later I changed the spark plugs and boots. I then noticed that the interior lights weren't working and tracked down a couple of other electrical issues--button to release liftgate window and the rear wiper weren't working. Took it back to the shop, they traced it to a blowing fuse (#8) and said there was a short somewhere in the liftgate, perhaps the wiper motor or liftgate window button. They are tracking down the short now. I can replace whatever component they identify as busted.   Are these things related? Could the busted cooling fan relay have caused a short in one of the liftgate devices? Could I have jostled/pinched a wire in the engine bay (while changing the spark plugs) that caused the short? Do I have a ghost? Thanks for any advice.
#148 of 208 02 GRAND CHEROKEE WON'T START by kampy1 Jun 26, 2009 (6:55 am)
MY JEEP HAS 132,000 MILES ON HER SHE JUST STARTED TO ACT UP. THE FUEL GAUGE STATES THERE IS NO GAS IN THE CAR. I ALWAYS FILL MY TANK. THE CAR WILL CRANK BUT THE CAR WILL NOT START AT ALL. I DON'T KNOW WHAT THE PROBLEM COULD BE. MY SECURITY KEY LIGHT JUST CAME ON ALSO. COULD THIS BE A PROBLEM ALSO. I'M TRYING NOT TO GO TO THE DEALER SO THEY CAN TRY TO CHARGE ME A ARM AND A LEG. Replies to this message: barryz (Jul 02, 2009 10:46 am) barryz (Jul 03, 2009 10:01 am) barryz (Jul 07, 2009 11:33 am)
#149 of 208 Jeep Grand Cherokee Weird electric problem by lawrence56 Jun 29, 2009 (12:35 pm)
When I try enter my vehicle the wireless button does'nt work. I open manually and enter, my dome light does not work. When I try to start it the gages go round and round. It acts like it is totally dead. Then after three or four tries it starts fine. I also noticed if this happens if I slam my drivers door a few times the dome light goes on the it starts right up. I have had it to a mechanic he replaced the ignition switch and the pcm computer. Does anyone have a fix for this?
#150 of 208 Re: New battery keeps draining. [sufe70] by parist21 Jun 29, 2009 (8:07 pm)
Replying to: sufe70 (May 06, 2009 9:33 am) Pleassssssseeeee HELP! Hopefully you found out what was going on with your jeep... I have a 97 jeep grand cherokee larado V8 that is KILLING ME with the exact same problem. I parked it for awhile when i came back to start it the battery was i too shrugged it off. i replaced the battery with a optima red cap and have since gone through two of them in less than two weeks i don't have the money to send it to a shop to get fixed Replies to this message: 96jeep2 (Aug 24, 2009 3:06 pm)
#151 of 208 Frustrating 1998 Jeep Grand Cherokee Electrical Problems by chicjeep Jul 01, 2009 (2:36 pm)
Ok here's the deal. I've only owned the vehicle for less than a year. Bought it off a friend when I needed a vehicle. The only issue it had at that time was that the gas gauge would float up and down. Well in the past two weeks some weird stuff has been going on... The dash light blink on and off The Blower Motor on the heat/AC won't work The interior lights are stuck on even when I remove the keys from the ignition. Anyone know what could be the problem here? Any advice would help. Thanks
#152 of 208 Re: 02 GRAND CHEROKEE WON'T START [kampy1] by barryz Jul 02, 2009 (10:46 am)
Replying to: kampy1 (Jun 26, 2009 6:55 am) i was wondering if you solved this, my 99 grand cherokee laredo 6cyl 4wd just started this exact same issue today, fuel gage at 0 fuel warning light on and security key light on which is a light i never remember seeing before, i tried my other key with no help, i have 153000 miles, i have owned since 130000, was running like a new car until now, yesterday i had front end aligned and tires rotatated which should not have caused a problem, mechanic test drove after alignment and gave me the car with the engine running, i drove home, shut jeep off, this morning cranks but no start, fuel zero and security key lite on. i called the service manager where i had work done, he asked me if i had moved the tilt sterring, i told him i thought his mechanic had, he said he vaugely remembers that there is a wiring harnes on sterring colum that sometimes pinches when wheel tilt position changed, maybe a wire to ignition switch was pulled loose but i haven't solved, i have changed all fuses related to starting even though they look ok, no help. IF YOU HAVE ANSWER PLEASE HELP!
#153 of 208 Re: 02 GRAND CHEROKEE WON'T START [kampy1] by barryz Jul 03, 2009 (10:01 am)
Replying to: kampy1 (Jun 26, 2009 6:55 am) i just paid to ask an expert on justask.com, a jeep service manager and ASE in automotive electrical, he said the fuel warning light and security key light and no code indicate cps crankshaft position sensor, that it shorts the PCM so it won't display a code, replacing cps should fix problem, i'm having mine towed to a repair shop next week when my AAA membrship for towing takes effect. my choices were tow 30 milles to dealer for parts and labor close to $300, or the local napa repair center for about $130. I have seen many postings here where people replaced this and it did not fix, its also a very hard part to get at, so i'll let the shop fix. The mechanic there agreed with my expert that the fuel warning light and no code being stored make the cps the first place to look, especially on a 1999. He is gonna verify before changing part, keeping my fingers crossed, will post back with results. These internet forums are helpful, but electrical issues with cherokee seems to be a stumper on this forum. Last year my radiator fan got stuck on and drained batterey, then would not come back on after jump, code pointed to fan relay, forums said same, it was fan relay, this case is not as clear cut. I don't understnd why Jeep puts fan relay in suc a hard to reach area, nor do i understand the point of this cps, since what it does is stop spark and fuel if senses crankshaft timing off, and since there is no common adjustment to change timing, what is the point of cps? though i think perhaps it sends a pulse train to pcm to tell it when to send fuel to each injecter and when to fire each plug, takes place of rotor cap, the old ways were easier to fix for sure.

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