Last post on May 19, 2013 at 12:16 PM
You are in the GMC Jimmy
What is this discussion about?
GMC Jimmy, SUV
#199 of 307 Help - - 2000 GMC Jimmy
Nov 05, 2009 (11:35 am)
My Gmc Jimmy keeps cutting off on me, I can be crusing on the hwy, road and it will just shut down. I will let it sit apprx 30 sec - 1 min and it will start back just fine, but will cut off on me again, seems like when I press on the gas pedal it acts as if the gas is not getting to where it needs to go (when the truck cuts off the signal I get is the battery light comes on) it did this also before I bought a new battery. I have a also replaced the fuel filters and the multi fuel port injectors. Can someone please advise this woman on her vehicle before I spend another dime on it., also it make this kind of 'changelink noise" when I press on the gas, and when AI sit at the light...Please Help...
#200 of 307 96 Jimmy 4wd Problems
Nov 30, 2009 (9:00 pm)
Just bought a 96 GMC Jimmy from a dealer auction the other day for a winter vehicle and found out the first time I went to use the 4wd in a wet field that the 4wd didn't work. The light for the 4Hi comes on and you can hear it make a sound under the vehicle like it's transferring into 4wd but still doesn't work, when I push the 4Lo button all it does is flash and I can hear it under the vehicle transfer back to 2wd when I push the button for 2wd. What could cause the 4wd not to work when I can clearly hear it transferring back and forth from 2wd to 4wd.
#201 of 307 Re: same issues 4 wheel drive [howie59]
Dec 02, 2009 (7:32 pm)
Problem is with 4wd computer on passenger side of car, under carpet next to door. Corrosion of contacts makes 4wd go crazy. Cost me 2000$ in miscellaneous BS to find this out!
#202 of 307 4x4 problem
Dec 02, 2009 (7:46 pm)
I have reviewed the posts, I can not find a match, any time I push a 4 wd button the lights start blinking and the 4wd does not engage, if i push 4w low you can hear the tc down shift, i have checked all the vacum lines and i am getting vacum to the switch on the firewall. Here is the what i have found if i ground the switch on the firewall the white wire i believe the 4wd engages and most of the time it stays engaged. It will return to 2wd any time i push the 2wd switch, I have a 99 jimmy with a 4 button 4X4, I have also checked the connection on the computer on the passenger firewall.
#203 of 307 Re: same issues 4 wheel drive [jimmy2001]
Dec 02, 2009 (7:53 pm)
That's funny you say that I just bought a transfer case control module for the passenger side today from a scrap yard, and sure enough.....it still didn't work. Is there a way to get the computer tested to see if it works before I go spending a fortune on a new one. So far i've replaced the transfer case control module, vacuum actuator, dash board switch, and I also found a vacuum plug on top of the transfer case not pluged in but still NO 4wd. What else could cause the 4wd not to work?
#204 of 307 2000 GMC Jimmy, clicking noise
Dec 20, 2009 (9:23 pm)
2000 GMC Jimmy, vortex v6, SLE, 3-button 4wd, NP233, NP1.
I've read most of the postings and searched, but didn't see an experience quite like mine. Coming home from vacation, about 250 miles from home, cruising down the interstate at about 80 mph, (2wd of course), heard a faint clicking sound thru the ventilation system. As I slowed down to take the next exit, this became very, very loud. It reminded me of a playing card flicking in the spokes of a bicycle wheel, only metallic (metal on metal) and very loud, and slowed down and then quit as I came to a stop at the bottom of the exit ramp. The clicking returned as I drove to the nearest gas station, where I found this sound was coming from near the transfer case, louder on the passenger side, and occurred in both forward and reverse.
I drove from the gas station to a GM dealer, about a mile (clicking all the way). This is my first 4wd, so I'm not all that familiar with the 4wd workings, but if I understood the GM mechanic, he said my problem was that the encoder motor was bad - the clicking came from this part engaging and disengaging. He didn't have a replacement (thank god $$$), so he disconnected the vacuum line at the actuator located under the battery and plugged up the vacuum the line. I could get home, but 4wd was disabled.
Now, as I understand from reading the posts, the encoder motor is used to engage 4Lo. I don't off-road, nor do I tow anything heavy, so I don't really need 4Lo. And the encoder motor is rather expensive for me, so here's my question. Can I simply disconnect the wiring harness from the encoder motor and reconnect the vacuum line to the actuator located under the battery so that 2wd and 4Hi function without 4Lo capability? Would doing this throw off the TCCM and disable the 4X4 system altogether? I really only want to use 4Hi on pavement with snow/ice, in bad whether, and since the 4Hi engagement system is a vacuum/mechanical working, could I just disconnect the encoder motor AND the TCCM, or would this cause problems with the other computers?
Dec 26, 2009 (1:20 am)
Been reading up on the very many likely problems that could be causing a malfunction. This isn't my first 4wd, I drive a jeep xj and wheel it often, the jimmy is my mom's. Anyways, it being midnight, i just went out and unplugged the battery and let it sit for 30 mins. I could hear the sound from the disconnect, I'm assuming, its coming from under the dash, and the 4hi light flashed then went off. After 3 times or so of trying this the lights on the gear selectors dim then go off. I'm guessing there is a combo of Tccm and vacuum problems. But until tomorrow i won't know for sure. My question is, what would be causing the indicator lights to go out, is it more likely the tccm or the dash switch itself?
Thanks for the help chevy electronics experts!
Edit: Forgot to include vitals, its the np233, 3 button(why can't it just have my trusty 231 behind that 4L60?)
#207 of 307 transfer case control module (TCCM)
Jan 07, 2010 (2:18 pm)
Hello all, i posted some questions in the past about having what I thought to be engine problems having to do with my 1999 Jimmy hesitating when engine was cold. After replacing everything I could think of on the engine to try to fix I decided to take it in to get a transmission test ran(which can be done for free). The tech said no codes were coming from the tranny but was getting one from the transfer case. Ended up being the tccm, moisture had gotten in there and corroded some of the connections. I went to a dealership to get a price and it would of cost me about $525, I said hell no so I went on ebay and got a brand new one for $200. I hope this saves someone some time and money.
#208 of 307 4 wd stuck in 4Lo
Jan 09, 2010 (7:23 am)
I have a 2000 Jimmy that was blowing fuses when I pushed the 4 Hi button. It's been below zero lately so need 4wd. I started it and the 4 Lo button was engaged so I put it in neutral and pushed the 4 Hi and it just blinked, heard a clunking sound under the floor then nothing, still in 4 Lo. Cannot drive the car in this gear, how do I fix this problem?