Question about 2006 Ford F-150

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2006 f-150 4x4 switch will not engage

What can I check

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  • mike2vogel Dec 23, 2008

    4x4 was working then it just stopped. No light indicator and will not engage into 4 wheel drive. help!!

  • Anonymous Jan 03, 2009

    I have the same problem. Took into the dealer and they said it was fine. when I drove out of the lot I checked and it did work. Never used it again until I went skiing. Pulled out of the parking lot, snowing, turned my selecter switch and again, no 4x4. And, the vehicle is out of waranty.

  • Anonymous Jan 03, 2009

    Same problem as the other writers. 4x4 switch worked fine for weeks in the snow ... then just stopped working one afternoon. Dealer didn't offer any suggestions, except to make an appointment on their 1 week wait list!

  • kibblepuppy Jan 30, 2009

    mines a bit worse. my switch works, lights come on but when you hit the gas all you get from the front diff is a nasty metal crunching sound and loud metal to metal sound

  • Anonymous Feb 11, 2009

    For me the 4X4 HI engages fine, but the 4L never does

  • Anonymous Mar 01, 2009

    My 4x4 switch will not light up or engage. The dealership is no help.

  • Anonymous Apr 17, 2009



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Sounds like a 4wd actuator relay.

Posted on Dec 26, 2008

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My truck did the same, it was the seleniod and the motor that changes it to 4x4 that was bad. I could tap on the seleniod underneath the truck and it would work.

Posted on Jan 31, 2009

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SOURCE: 2005 f-150 4x4 not engaging

First of all, the problem was caused by lack of use of the 4x4. The fix was to have someone sit in the seat & turn the switch while 2nd person tapped on 4x4 solenoid underneath the truck (next to the gearbox (seen from rear of truck) about directly below middle-rear-seat). It must have become stuck (or rusted) together? Little taps while engaging switch 'unfroze' it. My 2 fuses that were blown were probably caused by overloading when I first tried to use the 4x4 while it was frozen out. Since fixing, just be sure to turn it on (and off) frequently, even if you don't need it. You don't actually need to drive with it, just engage it temporarily.

Posted on Jan 01, 2009

  • 984 Answers

SOURCE: Dash selector does not engage

Operationally vacuum holds the IWE ( Integrated Wheel Ends ) out, and once vac is removed the spring engages the IWE.

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
If it turns it is a problem with the transfer case.
If it doesn't it is a front axle engagement problem.

- If the front drive shaft does not turn :
Shut of the truck ( still jacked up, and supported ) remove the vac lines from the IWE. The spring should push the gears in, without the vac line on.
Check the vent line ( tube that is routed into the engine compartment with nothing attached to it ), for blockages.
If the vent line is clear, and with the vac lines off the IWE should be engaged ( both front wheels locked ).
If they lock, the problem is with the IWE solenoid not shutting off vacuum to the IWEs. There is a TSB on the 2004-2006 IWE solenoids, a newer revision has been made, and used from 2007 and newer MYs.

Here is a block diagram of the IWE system

If the front drive shaft turns, it is either the connector to the transfer case or the transfer shift motor not functioning correctly.
Check the connector for corrosion on both the male and female pins.
Turn key to run ( do not start ) and have someone turn from 2WD to 4H and back again while hitting the transfer case with a dead blow hammer ( not a steel hammer ) to see if the shift motor is hanging up.

Not sure if selector does not engage 4x4 hi or 4x4 low means the lights on the mode selector switch do not change, or if the switch selects 4H, but the front wheels do not function, so hard to provide a true direction on where the problem could be.

Posted on Dec 13, 2010

  • 1 Answer

SOURCE: 4x4 F-150 2004 4X4 WILL NOT ENGAGE


Posted on Sep 15, 2009

  • 984 Answers

SOURCE: My 2006 f 150 4x4 with auto locking hubs is

How fast are you driving when shifting into 4WH, and how cold is it ? You are only trying this in 4WD-Hi correct ?

Posted on Jan 19, 2010

  • 2 Answers

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Posted on Jan 02, 2017

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