4wd switch not working

[bramas02]

My 99 Yukon is stuck in 4 wheel drive. I'm assuming it's the actuator but I need to know if there is something that will tell me for sure.

When I hit the button to take it out of 4wd I can here the actuator trying to do something but the light will just blink and than go back into 4wd or auto 4wd.

Anyone have any advise?

 

Tim

[Mike G]

If you haven't had this fixed yet... I had the same problem not going into 4x on my little Blazer, the problem was a $40 vacuum modulator that was located under the battery.

 

--Mike

[Tweeter400]

I had the exact same issue with my 01 Sierra. They replaced the Button module in the dash. They had a lot of issues with these.

[HighSierraZ-71]

My 06 GMC Sierra, with 528 miles on it would not get out of 2wd. Only flashing lights on the switch. After 2 days at the dealership, and replacement of the encoder motor, it turned out to be loose connections on the fuse block!

[lost_in_alabama]

Before you spend any money, pull the switch out of the dash and re-seat the wiring connector on the back. That fixed my 1998 Suburban similar problem.

[mightybg]

There is a common problem with the pushbutton assembly on the dash, the solder joints for the switch were cold soldered and tend to crack and make very poor connection. I fixed this on my buddy's truck with a quick reheat and reflow of solder. If you feel confident enough to pull the switch apart and resolder it this might work, or I think a new switch from GM is around $50 or $60 dollars but you may eventually have the same problem.

[lost_in_alabama]

I paid $74 at the Chevrolet dealer for the switch on my 98.

[Surf Fisherman]

I paid $74 at the Chevrolet dealer for the switch on my 98.

 

I paid 120.00 to have my old one replaced with new on my 94 sub.