When i push the buttons for 4hi or 4lo they just blink. When i got the truck a couple months ago they would blink about 5 times then stay on and the 4wd would engage. Now they just blink. The other day i was driving home and noticed my 2wd light that is usually on wasn't lit. When i got home i tried pushing the 4hi and 4lo buttons and they wouldnt light up either. When i drove it the next day the 2wd light stayed on like normal but when i push the 4hi and 4lo buttons they just blink and never stop blinking to engage. The 4lo stopped blinking to engage once and i could hear it under the truck but would never do it again. All i get is a blinking from the 4hi and 4lo. I had the transfer case checked out by a transmission shop when my transmisson was getting rebuilt and everything was okay with the transfer case. The guy even swapped parts off of another transfer case to see if that would fix the 4wd issue but it didn't work. Could it be the actuator switch on the axle? Please Help this is frustrating.
If they are blinking I believe it means that there are fault codes present in the pcm. You need to get the computer scaned to see if there are an codes present. If you live near an Autozone or Checker autoparts they can scan it for free.
SOURCE: 04 Z71 4wd problems
can you hear the shifter motor trying 2 shift? if not its the shifter motor open the door and try 2 listen when your trying 2 shift it
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i have a computer scanner at work and when i hooked it up it came back with no codes.
I haven't taken the actuator switch out to check i just didn't know if that would be the problem yet. I will try tapping with hammer and see if it engages.
Good luck bud and lemme know if it works... if not I will try to come up with some more information to try and help you.
Start your vehicle and place it in nuetral. Then try tapping on the actuator with a hammer while someone pushes the 4-hi button inside the vehicle. Sometimes lack of use of the 4wd system will allow for corrosion to build up inside the electrical part of the actuator. Tapping on it with a hammer can knock this corrosion loose and allow for electrical contact to be made, ultimately engaging the actuator and locking in the 4wd.
Have you remove the acuator and check it?
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