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05 f250 4x4 not working

Discussion in 'Ford Trucks' started by fatheadon1, Nov 24, 2008.

  1. fatheadon1

    fatheadon1 Senior Member
    Messages: 406

    Shift on the fly when i hit the switch to 4x4 i get nothing no light and no 4x4 if i turn the truck off and restart it it goes in fine anyone have a clue what could be wrong again truck is an 05 f250 diesel 4x4 85000 miles
  2. hydro_37

    hydro_37 PlowSite Veteran
    from iowa
    Messages: 3,790

    Maybe it is a loss of vacuum? Just a guess.
  3. Gicon

    Gicon Senior Member
    from MA
    Messages: 989

    Yea, I would think there is a problem in the hubs.
  4. wrtenterprises

    wrtenterprises Member
    Messages: 73

    We had a couple of small events this week, and I found that my Super Duty had the same issue. Needless to say, waiting until the first event of the season to find a problem this large is a real anxiety builder! However, we completed snow removal the ole fashion way, with the Snow Commanders, and still made plenty of cash.

    I have ordered a set of Warn manuals, and they will be installed on Black Friday. $220.00 per set ( nephew is a parts manager. ) No more vacuum shift on the fly for me......

  5. ZamboniHDB

    ZamboniHDB Senior Member
    Messages: 338

    No 4 x 4 light on the dash wouldn't be as a result of a vacuum leak in the lines or hubs. The transfer case isn't operated off of vacuum either. Obviously an electronic malfunction like a sensor, switch, relay, or module. A trans shop should be able to diagnose it and not throw random parts at the problem to solve the issue.

    Just my .02¢
  6. Bernie Lomax

    Bernie Lomax Senior Member
    Messages: 139

    There are several relays in that system. Also could be the shift motor. Those ESOF systems are a nightmare. Never again on my trucks.
  7. RobbieB

    RobbieB Senior Member
    Messages: 122

    I would hazard to guess your transfer case motor is going out. The 4x4 light in the dash is powered off of the output wire from the motor so if it dies the light won't come on. Had it happen to my Excursion.
  8. Deere444H

    Deere444H Junior Member
    Messages: 27

    If the light never lights up, It never Shifted the transfer case, Try slowing down, and trying that, if your trying to go into 4 lo. you need to be stoped and in Nuteral. you may just be puting it in wrong, refer to the manual, and double check you method, the system is pretty simple, Two relays, controlled by the SJB, and the shift motor, the shift motor has a sensor that changes the light, and commands the PCM to lock the front hubs.. Havent seen many problems with the 05 up front ends, TONS with the 99 to 04 front ends, but sounds like an electrical/transfew case engagement, not Front Vac. Hub issue. Ill look at the workshop manual tonight and see what it says about engagment speeds
    Last edited: Nov 30, 2008
  9. Deere444H

    Deere444H Junior Member
    Messages: 27

    Alright so heres some info about shifting it... hope it helps. The operator can switch between 2H and 4H mode at speeds up to 55 mph To engage or disengage 4L, vehicle speed be less than 3 mph the brake pedal pressed and the transmission in NEUTRAL or clutch depressed.
  10. Ramairfreak98ss

    Ramairfreak98ss PlowSite.com Addict
    Messages: 1,931

    well my 06, just past the standard warranty 36,250, i tried 4x4 in some light mud with my trailer, 4x4 light lights up but no thunk/4x4... took it to the dealer they said its fine picked up, still fine so not sure what it was. Mine has the shift on fly too.
  11. Deere444H

    Deere444H Junior Member
    Messages: 27

    if the light is on, the transfer case has shifted, and the light is on from the position sensor, so it in fact has shifted, or.. the motor has at leaste moved where the sensor is, if the four wheel still dosent work.. suspect your auto lock hubs, to verify.. shift into four wheel,, then move the hubs from the AUTO positon To the LOCK positon. give it a whirl....