Question about 2005 Ford F-150

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The 4wd wont engage the light comes on and says it is and you can also hear it sound like transfer case is switching over but doesn't actually work.

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  • 27 Answers

There is an actuator in the front diff. it may not be working

Posted on Jan 03, 2011

  • djjg007 Jan 03, 2011

    also see if the front drive shaft turns when 4x4 is engaged

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4wd light flashes and have replaced the front actuator switch and the encoder(transfer case motor) and nothing has changed. it sounds like it wants to kick in but never fully engages. I have had people on...


after looking at the schematics for this vehicle, I can say with great certainty that you might have something wrong in your front axle on a straight axle model that wont let the servo engage the front axle. Now if you have independant front suspension, then where the servo motor goes into the transfer case could be the problem. pull the servo motor from the case/axle and look at the engaging mechanism. You are looking for worn parts that could cause binding or broken parts. This servo motor gets its command voltage from the ecm. The signal for the ecm generates from the transmission and your in cab switch. If you can hear the motor trying to engage, then all the other factors are working up to the motor arm. The light is just a by product of the ecm trying to engage the front axle

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your problem sounds like either the transfer case control module located where you hear the clicking sound, or the actuator on the transfer case itself.

try unplugging the transfer case control module and then plug it back in, try engaging 4wd again (make sure your in neutral, coasting at 1-2 mph might help as well) if it still doesn't work check the actuator itself to see if the actuator is trying to engage. if the actuator is trying to engage but doesn't, take the actuator out and check it for wear or damage. if the actuator seems fine and it responds to the buttons when pressed i'd go after the transfer case control module as the culprit. ran into that a few times on those s-10's. 3 out of 4 that i've seen were fixed with a new tccm. 1 of the 4 needed an actuator, check your local junk yard for a working tccm or actuator.

hope this helps!

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4x4 wont engage


First thing to make sure of is to check for a blown fuse. The fuse location is marked 4WD and it should be a 25 amp fuse. If the fuse is bad, the lights on the 4wd console wont light up. If the lights do light up, then you can move to the transfer case. On top of the transfer case, toward the rear of the truck is a switch that has a 2 wire connector. That switch sends power to the front axle actuator when you try to enagage 4wd inside the truck. That could be bad. The switch is threaded into the transfer case and is still available through GM. If the switch is ok and the wiring that attaches to it is ok, then you can move up to the axle. Threaded into the front axle is the front axle actuator. These actuators are prone to failure in older trucks and is very prone to cold weather failure. You can test the actuator by removing it and then WITHOUT the truck running, put the truck into 4wd and then turn the key to the hot position. The plunger inside the actuator will extended outwards. More than likely it will be one of those 3 things. If it still wont engage, you may have a short in one of the wiring harnesses associated with the 4wd system. Also, you may have a damaged transfer case. To check the transfer case, put the truck in 4wd without it running and then crawl underneath and see if you can turn the front shaft by hand. If not....it's good. If you can....then the shifter forks inside the case are worn or damaged. I hope this helps.....start small and work your way up!

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