So i have a 2012 XLT 4x4. I went to pull my boat out of the water and the water was so low that the trailer and the rear truck tires were past the end of the ramp (usually no big deal just engage four wheel and go). This time the light came on and everything said it was in 4x4 but no dice. My rear tires dug in and no front tire action. Since the water was so low i actually had a not so good day having hit a sand bar and breaking the rudder of of my boat. So with that and the 4x4 not working i was about to just sink the damn truck. Then i got to thinking, i had replaced the front hub actuators a while back and remembered that it was all vacuum operated and without vacuum the hubs lock in. I disconnected the vacuum line from the solenoid and presto four wheel drive works. I think i need to replace the solenoid but if you have other opinions please chime in and if anyone knows what the part # is please let my know.

 

Nothing to add, but you get a free bump for some nice, quick thinking!

 

I agree with the quick thinking! It's awesome that you understand the mechanics of your truck that well.

It certainly sounds like the solenoid or possible a bad connection to it. I'm not sure exactly how to measure it but it would be worth making sure that the solenoid is properly powered and grounded.

 

Thanks for the bump and i will check for power and ground at the solenoid today.

 

I think you got it right. Ford updated the solenoid design due to issues.

 

I have been trying to find the solenoid online but every time i think i have found one it is for 2008 and older.

 

Well i checked the circuit at the solenoid and everything works up to that point. Now i just need to find one.

 

Just for reference, where in the engine bay is the solenoid to pull the vacuum line to engage 4wd manually? That info could be a lifesaver for others to know in future scenarios like this one.

 

The solenoid is located on the far driver near the fire wall. I will post a picture of it a little later.