Question about 2005 Ford F-150

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2005 f-150 4x4 not engaging

2005 f-150 4x4 extended cab 4x4 is not engaging when the dial is turned

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  • the nag Nov 02, 2008

    My 06 f150's 4x4 is not engaging, the light does not come on when the switch on dash put in 4H or 4L This was an occasional problem that progressively got worse, to the point of not working at all. only 40,000km on it.

  • JMccart216 Nov 05, 2008

    My 2005 F150 has the very same problem. At first the 4x4 occasionally would not engage, now it will only occasionally engage.

  • Nathaniel Pyle Dec 04, 2008

    I just tried mine and it did the same thing. It is only 14 degrees out. I did take mine in for the vacuum recall, Makes you wonder if the dealer did something.......mmm other wise the truck is great, I was told via Advance auto, the vacuum could be my problem.... will let you all know

  • ddg108 Dec 08, 2008

    I have a 2005 and my 4x4 does not work either in H or L. I checked all the fuses. No lights come on except during start up check. No relay sounds.

  • teeodore Dec 19, 2008

    2005 f-150 4x4 also not engaging. Checked fuse #11 (4x4 solenoid) ok, then #29 & #30 (PCM 4x4 Power) both blown. Replaced 15A fuses, still not engaging (rechecked #11,29,30 - fuses not blown). Dash lights show 4x4HI 4x4LO on startup, but not when using switch (also no audible noises of attempted engagment). Next job is to pull every fuse & check. Any suggestions?

  • Anonymous Dec 20, 2008

    2005 FX4 -turn knob to engage four wheel drive and nothing happens..worked perfectly for first few times i engaged the 4 x 4, but now it wont do anything..light doesnt come on, no buzzer, no nothing..

  • darleypump Dec 21, 2008

    I try to turn the switch on my 05 F150, nothing. No noise, no lights, nothing. It worked 3 weeks ago hunting, then the other day, nothing. I have checked fuses, and they all appear ok. What next, switch? or take it in?

  • NCollins4 Dec 22, 2008

    I have 2005 f-150 4x4 I turn on the dial 4hi and 4 low light not on and not engage both not work .

  • Anonymous Jan 05, 2009

    I used my 4x4 in town on my way to a road trip. I turned it off, went about 250 miles and it wouldnt turn back on again. I have been using it a lot lately, but it has mostly been engaged due to the weather. I checked all my fuses and they were all fine, but I dont know about my relays. I dont know much about trucks and I dont want to pay Ford $500 to fix a relay.

  • cdoyle99 Jan 11, 2009

    Yep I use my 4X4 maybe 3 or 4 times a year today we go skiing get 4" of snow so I turn the knob and no 4x4 light on the dash neither hi or lo working and I get stuck in the parking lot..... go figure! Can temps below 20F cause it?

  • tlawrph Jan 16, 2009

    I have the same problem, except that the 4Hi and 4Lo indicator light comes on but it does not engage the front wheels. It seems to happen most often when its cold (when needed the most). It will also disengage itself sometimes when under a strain, Last year I took it to the dealership about this problem and they said a wire was loose and they fixed it.RIGHT, It worked for a week or so and now its even worse.

  • Anonymous Feb 11, 2009

    Mine was working fine. Used it rairely. Went to a Christmas tree farm and tried to use it and nothing....

  • bigsnake Apr 03, 2009

    my 2005 F-150 4x4 seems to disengage when in 4 wheel drive. it seems like it just kicks out when in use and it will kick in and out the whole time in use

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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

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Tap the selenoid on the transfer case while someone is in the truck working the 4x4 switch - it works... I replaced the Vacuum Selenoid on the firewall as well as the 4x4 relays for nothing, The transfer case selenoid was stuck. Ford wanted 700 bucks to fix it, with all the new parts I used it totaled 45 bucks, but all it need is a few taps with a rubber hammer. It's a Very Very simple fix...

Posted on Oct 09, 2010

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I had the same prob. after about a month i decided to turn the vent to the off position then i switched into 4hi and it went .maybe its a reset of some sort or maybe just me.

Posted on Jan 01, 2009

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Either the switch is bad or the motor that controls the switch some models also have a vacuum switch on top of the transfer case that gets stuck

Posted on Nov 11, 2008

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1 Answer

Why does my 2007 f150 4 x 4 not engage?


Visual Inspection Chart Mechanical Electrical
  • Half shafts
  • Integrated wheel-ends (IWEs)
  • Shift lever and/or linkage
  • Driveshaft and universal joints
  • Vacuum leaks
  • Fluid leaks
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  • Central junction box (CJB) mini fuses:
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    • 28 (5A)
    • 29 (15A)
    • 30 (15A)
  • CJB fuse 111 (20A)
  • Wiring harness
  • Mode indication switch (MIS)
  • Synchronization clutch
  • Connector(s)
  • Integrated wheel-end (IWE) vacuum solenoid
  • Circuitry

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