I have a "06" F150 5.4 with 73,000 miles on it. Last year I noticed that it went into 4x4 high without any problems but it does not go into 4x4 low. Now I rarely use low but I would like to know what cause be causing this.Any help would be appreciated. Thanks

 

Do you use the proper sequence?

Shifting to/from 4L (4WD Low)
1. Bring the vehicle to a complete stop.
2. Depress the brake.
3. On vehicles equipped with an automatic transmission, place the
transmission in N (Neutral); on vehicles equipped with a manual
transmission, depress the clutch.

 

X2
To get it back out you have to do the same order...
stopped in neutral with brake applied and then switch.

 

It's electric. Never did that sequence before. Just stop and switch the **** to lo and go. Just wondering if it could be a sensor that's shot?

 

Try the sequence before dreaming up other stuff.
It's from the owners manual and how it is supposed to be done.

If the sequence does not work, then begin the troubleshooting process.

 

It should never work that way. You must follow the steps provided. Trust us, we have the same truck and we have to do it in order.

 

Tou can shift from 2wd to 4wd by turnng the switch. To go to 4wl, you have to follow the procedure above.

 

There's no bad sensor.

Simply put, the vehicle has to be stopped with no pressure on the driveline to swap from low to hi amd vice versa, hence why you have to be stopped, in neutral, with your foot on the brake.

 

Not !

 

When I first got my truck my wife managed to get it in 4 low. Couldn't figure how in the heck to get it out. Long story short called the ford place, felt like a D.A. and followed the procedure above.