All wheel drive dont work

Check your hubs lift front end if wheel does not turn when locked in 4x4 then hubs are not engaging turn wheel by hand or a pipe wrench on drive shaft do not try power unless all wheels are lifted

check that the hubs are locked in correctly (both sides)

manual or auto hubs?how do u now it is not engaging?.u can lift the front end up in 4 wheel make sure hubs r engaged .rotate the tire by hand ,and check to see if the drive shaft is turning [from the wheel to the front diff] u most likely have a bad locking hub.if it is not turning ur front tire is not locked up

Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?

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.

I would suspect that the front drive shaft does not turn, and the issue is with the vacuum lines for the front axle.

You can check the vacuum lines with the engine running, and have a vacuum gauge on the front disconnect motor. Pink line is 2WD operation ( unlocks the front axle ) Light Blue is the 4WD operation ( locks the axle ).

The disconnect motor is on the front axle, item #10 in the picture below


Picture of it.

Sounds like the IWE ( Integrated Wheel End ) did not lock in for some reason.

Could be the IWE solenoid did not shut off the vacuum to the wheel ( usually the solenoid problem is the other way around ).

Could be the vent tube from the IWE into the engine compartment is plugged.

Also could be a problem with the transfer case.

Is the system ESOF ( Electronic Shift On the Fly ) or MSOF ( Mechanical Shift On the Fly ) ?

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


Start with the lifting and supporting the front of the truck to check the front drive shaft when 4H or 4L is engaged to know which way to look.

Some times the connector on the transfer case for the ESOF version can be corroded and just needs to be cleaned.

my computer problem is hard disk system found warantty hard disk

the front axles have pinon gear box that the shaft from the transfer case goes to, it has a vacuum hose to it or a solenoid actuator check these for proper function this is how the power is turned on to the wheels.

there are vacum line one on each side behide the wheels see if they are broke or leaking i had the same problem

acuator at transfer case or at frt diff if acuator is moving then axles to wheels should be turning and you may have a hub locking problem. if axles to wheels dont turn then the acuator tofront diff is no good not strong enough or bent shaft on acuator, some of these use a small shaft in front of actuator also make sure if this truck use this shaft check it for wear, lift truck remove actuator push inside arm in see if wheels spin turn frt shaft while holding arm in wheel should turn is they do, replace actuator, if they dont turn then diff problem,

sounds like either a fuse or the do u have locking hubs that need to be engaged also when using 4 wheel drive there is actually only 2 wheels turning usually passenger front and driver back sometimes u also have to drive backwards to engage and also disengage 4 wheel drive finally it may be a transfer case problem check drive shafts and u joints make sure they are engaged