Last post on Nov 27, 2013 at 8:15 AM
You are in the Chevrolet Silverado & GMC Sierra
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Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck
#27 of 396 Possible solution
Mar 07, 2007 (2:37 pm)
I have a 2000 Chevy Silverado 2500, my sevice 4wd light was on. I had taken it to a local transmission repair shop and I was informed that my transfer case connectors were corroded and was not getting a good connection, so whenever it would rain or snow my service light was on. After repairing this and $450.00 later. The service light still persisted to come on. So I went to a GM dealer and bought a new switch, this finally fixed the problem. hope this helps everyone. Major suggestion given "check the switch first it is only $65-$70 brand new.
#28 of 396 Re: Possible solution [sly4i]
Mar 09, 2007 (10:54 am)
Thanks for the heads up!!...I will try the switch first. I also spoke with a couple of buddies who work for GM electrical and they suggested replacing the switch also. Interesting about the connectors on the transfer box...I think I will clean them up just in case and spray them with a protective coating, if nothing more might save me $450 later on.
#29 of 396 Re: Service 4wd Warning Message [harley1970]
Mar 12, 2007 (5:56 pm)
You need to try and change your transfer case control switch.
#30 of 396 96 silverado 4wd kicked in at 75mph
May 05, 2007 (8:12 am)
#31 of 396 96 silverado 4wd kicked in at 75mph
May 04, 2007 (3:59 am)
i have a 1996 silverado,bought from a friend .he never had a problem at all.ive had it 18 months and put 30,000 on it with no problems...has 110,00 on it now...90,000 of it is all hwy miles
on the way to work a couple days ago at 75 mph the 4wd just kicked in by itself..couple loud bangs seconds later came from the front wheel area.
anyone ever have this happen?
was stuck in 4wd for 10 minutes or so till i finally got it out into 2wd then pulled the fuse for the tranfer case so i could make it to work.
just had 2 front tires put on..slightly different from the rear..heard this could be the problem as you need to match them perfectly.
asked 5 diff friends and got 5 diff answers.
also isnt there some kind of failsafe so this wont happen if it happens to be a short in the switch?
drove it home with the fuse pulled (about 50 miles) with no noises..seems to be ok but im afraid to put the fuse back in till i find the exact problem.
has an automatic tranny.
#32 of 396 Re: 96 silverado 4wd kicked in at 75mph [kegabear]
May 04, 2007 (7:41 pm)
I'd look at the dash switch, the transfer case solenoid that controls the 4WD, and the solenoid that controls the engagement of the front differential. I think there's less chance of a problem with the tires. Factory spare tires are often smaller than the others - if that was the problem you'd hear a lot more about problems like you're having.
Did it shift into 4Hi or 4Lo? If it was 4Lo, then the problem is not in the front diff. - the diff. doesn't have two speeds.
Once you figure it out and do the repair, make sure you take it offroad and put it through the paces to make sure there was no damage. You don't want to find out when you really need 4x4 and it's not available.
#33 of 396 Re: 96 silverado 4wd kicked in at 75mph [1offroader]
May 05, 2007 (8:12 am)
it kicked into 4 hi..i have unplugged the solenoid and will take it out for a test once i have replaced the parts...tough to tell which one malfunctioned so i guess to be safe i'll replace them all..i know its all in sync but dam..should be some kinda failsafe speed so it doesnt kick in above like 50-60 mph
thanks for your help!
#34 of 396 '03 Silverado 4wd issue...
Sep 14, 2007 (10:47 am)
#35 of 396 '03 Silverado 4wd issue...
Sep 14, 2007 (10:47 am)
I have an 03 Silverado Z71 ext. cab. and just recently the 4wd system has been acting up...
I have the AutoTrac system and when I go to turn the truck on, sometimes it says it is in 4wd, auto or neutral. It then tells me to service 4wd, no other lights are on and I'm not turning on anything...
Most the time it is normal and in 2wd when I turn it on.
Mechanically the sytem works like normal when I want to go 4wd I just push the button as normal and it works...
#36 of 396 Re: 1998 1500 Z71 4x4 button lights [351suckazz]
Sep 30, 2007 (4:09 am)
Mine is 2004, but does the same thing. Have had it fixed twice under warranty (now out of warranty)and happening again. There is a Tech service bulletin on this, your mechanic friend should be able to pull it up on his computer