4 wheel drive not engaging?

Have you checked the linkage to the transfer case?

not as of yet hapened this morning. is that all their is just linkage or is their a solinoid or wireing

found problem. silonoid on front diff not working

my truck when running in 2 wheel drive runs great. as soon as it is put into 4 wheel drive it dosent want to go any where. it vibrates really bad. I had the transfer case and front differential checked out and i was told they are fine. I really dont know what to do next.

thanks
basit

OK so give me some info if you would. What do the 4x4 light do when you switch to 4x. Do they come on stay off or blink or ? Get back to me with what you can and we will go from there.

the 4x4 light comes on when engaged in 4 wheel drive and goes off when disengaged. the truck runs about 10 mph in 4 wheel and then it starts to grind and shake if driven more than 10mph. the gear ratio have been checked for front and rear diff they are 3.73.

Ok so if I understand correctly it only happens in 4x4 and not 2wd and the noise sounds like it is coming from the front? Just want to clarify thanks.

four wheel drive wont engage

Check to make sure there is power to the actuator on the transfer case. If there is, remove the actuator and check it for operation. If there is no power, check the relay and the switch.

I have a 2001 Chevy Silverado and last night I went to put it in 4x4 and it switched over then stopped working. Also once it quit working the selector lights went out so now I'm stuck in 2wd but its not showing if I'm in 2wd or 4x4 I'm scared to drive it due to the fact I dont know if I'm in 2wd or 4x4 help.

Nice site :-)

it may be the encoder motor on the t case, those go bad quite often. if you are careful you can clean them out by disassembling them and putting back to gather otherwise they are around $100

my 4wd severice light comes on and will not go in 4wd at all . i have replaced the buttons on the dash . still did not work. where is the vacuum actuator?

The first thing to do is scan the transfer case control module for trouble codes, there will be a code stored. Transfer case position sensors and encoders have had some issues on many others just like yours. Let me know the codes and I can give you a starting point for diagnosis.

I bought the truck in the spring and just tried out the 4x4 for the first time. I put it in 4lo and it went in. Then when I tried to take it out the dash lights ( on the 4x4 switch panel ) went out. Found blown atc fuse. Replaced actuator and encoder motor and no luck. Traced wires and found no breaks in them. My mechanic says I need a transfer case and 2 other garages that I know say I don't it's something else. Any info would be great help thank you

Hello,

I had this problem with my truck same year and model the switch was bad which I replaced it started working it might work for you as well. The instructions to change the switch are in the diagram below. Check out the diagrams (Below). Please let us know what you find.

I got a switch for $84.00 it took care of the problem

Im having 4wd problems. the message center service 4wd has been on for months and 4wd is not working at all. i bought a new dash switch and that did not work. i just bought a new 4wd front acuator and installed that. I can hear it trying to engage but the 4WD still will not work. any tips on getting it working?
Thanks for the help

check under the hood in the relay block. I believe there is a relay for the 4wd. Check that and let me know what you find. If you can hear it trying to work, it must not be getting enough power. Have you checked to make sure it is getting 12 volts?

I tested it and voltage is good. a guy i know says it could be the transfer case gone bad.hoping its not that.I also saw on the internet to check the fuses under the hood and i checked them but they where all good. another said to disconnect the battery for 10min and i tried that and no luck eather.Any other ideas?

Remove the actuator and make sure it is working properly.

my 4 wheel drive is not working i bought new swith but it still dont work all the buttons light up at once constantly will not engage or even attempt to engage no weird sounds when driving or nothing im so lost on wat it could be maybe some thing electrical idk i need help

There is a lot of problems with the shift motors on these. It is on the side of the transfer case but would bring it to a shop to insure you don't waste your money.

replaced 4wd switch on dash but still wont engage into 4wd , light on swith just blinks and goes back to 2wd. could it be actuator or transfer case motor?

The most likely cause is the mode switch. The one with the buttons to select 2wd or 4wd. I;d put money on it. Had to replace the same thing in my own truck.

my four wheel drive stopped working recently. no wierd noises just stopped working. replaced the electronic actuator but didnt fix the problem. Anyone know what might be the problem

Are the lights in the switch working?

yes when i put it into four wheel drive the light on my dash works. i think it is something in the case because everything else is working properly

You will need to have it checked for trouble codes in the transfer case control module.

ok. I have a hypertech programmer that reads dtc's will it pick it up

I can't tell you for sure. I can tell you that a Tech2 scanner will work.

my 4x4 suddenly quit working

Are you getting power to the 4wd actuator on the transfer case?

Joe