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Jeep Grand Cherokee, SUV
#819 of 1100 '03 JGC shakes violently when shifted into reverse!
May 05, 2011 (1:08 pm)
My 2003 Jeep Grand Cherokee has started to shake violently, and seems to almost stall, when I shift into reverse. It feels as if the gears are possibly slipping? I can keep my foot on the brake, and give it a minute or so, and it does fine, but if I let my foot off of the brake immediately after shifting, it starts acting up. It even does it when I'm not pressing the accelerator. If I try to accelerate, it causes even more of the shaking. If I let off of the brake, it will slowly back up, while shaking and almost stalling, for approximately 15 seconds, and then it's fine. Other than this issue, it runs, and shifts perfectly fine. I don't have this issue throughout the day...mainly just the first time I start the car for the day. I've collected the codes, which are P 1491, P 0122, and P 0455. Would any of these have anything to do with the problem? What are some things I can look at to try and solve the problem myself...I'd really like to try and avoid taking it into a mechanic!
#820 of 1100 Re: '03 JGC shakes violently when shifted into reverse! [abercc]
May 06, 2011 (7:03 am)
According to my 97 Jeep shop manual it could be a lot of things plus my manual is 6 years older than your jeep but: I suggest you check the gear shift linkage or if it's all electronic find a way to make sure shift lever position is being detected and processed poperly. For example, using a voltmeter I can test the throttle position sensor to make sure it is giving good info to engine computer.
#821 of 1100 Re: 2005 Grand Jeep Cherokee [annier2]
May 13, 2011 (3:24 pm)
did u find out the problem? i have 2006 doin same thing i brought to 2 jeep dealers they dont know issue. the engine flashes so when i put on computer no codes are stored. please let me know before i trade it in thx
#822 of 1100 no overdrive in my transmission
May 25, 2011 (7:07 am)
I have a 1995 Jeep Grand Cherokee with 220,000 miles. I had the transmission rebuilt 1 1/2 years ago. Now the light on the dash to turn the overdrive off for towing mode is staying on all the time. It has no pick up and go it just is slow starting to accelerate. Once driving things are fine just dont pull out into busy traffic from a dead stop unless you have the room. I tried disconnecting wire connectors on the trans to see if one of them would make the light go out and none did. I read that since this is a 1995 to read the transmission codes your supposed to watch this light blink after turning the key for codes but since mine stays on it doesnt even blink. I have not found anyone familiar with this problem. I am plenty capable of doing the repair if I was to know what to repair and where to look. Someone told me might be a speed sensor but where is it? Which senor is it? Is it inside or outside the transmission? Any help would be appreciated.
#823 of 1100 Re: no overdrive in my transmission [uncfuz]
May 25, 2011 (2:58 pm)
I'm assuming your transmission is a 42RE. An article describing that model is at: link title. Google "42RE manual" to find manuals online. I found one at: link title. Hope this helps. Please let us know your progress.
#825 of 1100 Re: no overdrive in my transmission [uncfuz]
May 31, 2011 (8:13 am)
I had a problem with backup light switch. The problem was that the switch was not getting 12V. You need to check +12 at switch or wire into trans if switch is internal. You also need to check the Ground wire. If +12 at the switch is not OK ou need a wiring diagram so you can trace it. In my case I traced it all the way back to the fuse box. +12 was OK on wire coming out of fuse box. I saw no obvious break in wire, but am unable to inpect it everywhere. I hooked up another wire, pressing a thin connector end into the fuse box along with the fuse. Then, I cut wire 1/2 way between trans and fuse box. Then I spliced in the new +12V. If you have this problem and splice does not give you +12 at the switch, it means wire problem is further downstream. I spliced mine at the firewall and it was ok. GND wire is easier to fix. You just need good connection to the chassis.
If your +12 wire has rubbed bare and is shorting to ground, the fuse should be blow.
Note: Electical switches are either active high (+12) or active low (GND). When you cut a wire you are making it float. Depending on circuit, it will float high, low or in between. My guess is most auto circuits will not have a pullup or pulldown resistor due to cost so it will go in between. If cutting a wire fixes it, it just means you were really lucky.
#826 of 1100 2003 Jeep Grand Cherokee - won't shift into reverse
Jun 08, 2011 (6:52 pm)
Have a 2003 JGC Laredo 4x4 inline 6 with 107,500 miles. Haven't had any major mechanical problems with it and have owned it for two years. Just within the last couple of months it has been making almost a grinding sound when shifting into reverse in the morning after sitting at night and shaking. It will stop and run fine if I put it into another gear then back in reverse. Well tonight it decided that it doesn't want to go back into reverse anymore. It's never slipped gear so we don't think the whole transmission is going out, and all of the 4x4 gears work fine - except for reverse. It doesn't make the usual regular shifting noise when you put it into gear for reverse, and when you rev it sounds and feels like you're just in neutral....could it be a vacuum or sensor issue with the reverse gear? We don't have any $$ to take it to a mechanic... All help would be TREMENDOUSLY appreciated! Oh - and the tranny fluid was just about bone dry so we refilled it with a couple of quarts and still nothing.
#827 of 1100 Re: no overdrive in my transmission [uncfuz]
Jun 20, 2011 (12:03 pm)
Hi, I have the exact same vehicle, with the with the exact same symptoms
and exact same problem. The overdrive light is on all the time and it takes off
in high when in drive. . This means that line pressure from the pump
is reaching the High or direct clutch and the intermediate band, applying both
and putting the transmission in high gear before you even take off.
I did the same as you did and disconnected all the electrical wires on
the transmission, transfer case and overdrive. Light stays on and still takes
off in high gear. So I am thinking that the trouble is inside the transmission.
My guess: governor solenoid always open, or valve body problem
Hope somebody somewhere has the answer. Cheers Gerry
#828 of 1100 94 Jeep Cherokee 4x4
Jun 29, 2011 (12:13 am)
About a month ago I purchased a 94 Jeep Cherokee 4x4 country edition. A few days later I started having some issues. After the jeep is warmed up and I turn it off. If I restart the jeep while It's still warm and put it in reverse it'll die almost always. Sometimes takes a dozen times before it will stay running. Also, lately when I'm driving down the road if I hit a bump or sometimes just go up a hill the jeep will feel like its jerking back. I took it to a mechanic and he promised me it was the idle air control. So he replaced it and I picked it up a few days after he had it and 300 dollars later. And same problem later that day after I picked it up. I took it back to the mechanic and now he says I need the transmission rebuilt and the transmission is causing both above problems. This jeep has 134,000 miles and is the 4.0 inline 6. The jeep doesnt rev up between gears or anything. Has anyone else had this problem?? I also thought it could have been the crank shaft position sensor but the mechanic swears it isn't but would be happy to change that part for another 200 dollars if I'd like. What should I do? I'm pretty sure this mechanic sucks and I'm going for a 2nd opinion but just seeing if anyone else has had this possible "transmission" issue.