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Old 02-07-2014, 09:23 AM
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4WD Not working in auto or manually locked?

Hey Guys,

I have yet to find a thread that discusses about someone having trouble with there 4wd in both auto and manual mode. I have a 2006 F-250. Since I bought it the auto hasnt worked. I am pretty sure that it has a leak in one of the vacuum hoses because I did the test of turning the air on the face and when you turned the 4WD on it goes straight to the defrost mode. Would you guys say that is pretty accurate?

Next thing is knowing this I have always turned the hubs when I know I might be needing 4WD. Well today I got stuck in my path to my house in 2WD but when I attempted to put it in 4WD with the hubs in the locked position it is still in 2WD. The light on the dash does come on in both auto and manual. The other thing that I will add on this time when it is not working it was pretty hard getting the passenger side hub to physically lock in.

Any help and insight would be greatly appreciated guys! Thanks!
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Old 02-07-2014, 09:34 AM
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Turn them back to the auto position and then back to lock just to make sure they are fully engaged. If that doesn't work, shut your truck off then turn the key on and turn your 4x4 switch and listen for a click under the truck. If you don't hear a click then check the relay under the hood. If it is good, you might have an electric shift motor issue.
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Old 02-07-2014, 10:11 AM
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Yes it does sound like you have a vacuum leak which would explain the auto, but not the manual portion.

Another thing to note, I know you said your passenger one is really hard to manually lock which might suggest that it has went out or almost gone out.

If it has and even if your drivers side is still good, there is a good chance you still wont get any movement out of the front tires due to having an open diff. The axle shaft is going to spin on the passenger side right off the bat in that case of the hub being bad and that could be your problem there.

If I was you I would lift the truck off the ground and see if your front tires or at least the axle shafts are spinning in 4wd. That will tell you a lot right there.
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Old 02-07-2014, 11:15 AM

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I had this similar issue with my 2006 F150 4x4..
I would engage the 4wd but it would not lock into 4wd... Apparently in the winter the motor that engages the 4wd on the transfer case was frozen and all I did was tap the motor (located on the driver's side of the transfercase) with a wrench/screwdriver/hammer. Don't tap too hard, you don't want to break anything inside.. After that, problem solved.
Again, I'm not sure if this is relatable to the F250 transfer case but it worked on my F150.
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