Hi just got a SsangYong rexton 07 plate the 4wd is dead the 4H light comes on when you turn the ignition on then goes out in less than a second and then nothing. cars in 2wd at the moment have no idea

SOURCE: I have a 2003 chevy blazer LS, 2-door 4wd w/

try putting in nuetral and then shift into high gear . if still does not work sounds like the 4x4 acctuator is bad

SOURCE: service 4wd light is coming on but 4wd works fine

i had the same problem in my 99,i replaced the switch assembly on the dash and all is well,hope this helps

SOURCE: wont shift from 2WD to 4WD

check switch , fuse and relay if good check cable hoses and wiring at transfer are not damaged or disconnected -check actuator for proper movement actuator has a tendency to stick lube actuator rod if necessary

SOURCE: my 2000 gmc jimmy is stuck in either auto 4wd or

Use the Owner's Manual to manually go into neutral and reset to 2WD HI. But then look under the hood check the fuses or look for wiring that may have come unplugged.

SOURCE: my 2001 f150 super crew won't shift from 2wd to 4h

Best to check by jacking the truck up ( taking safety precautions, parking brake, chock the wheels, jack stands, etc ), turn the key to the run position and place into 4WD.
If the front drive shaft turns, the problem is in the transfer case.
If the front drive shaft does not turn, the problem is in the front axle.

I would suspect the front shaft does not turn, and the most common cause of this is the vacuum motor on the front axle, the vacuum lines to it, or the vacuum solenoids.
The vacuum shift motor is what locks the front wheels in, and without this action, the PM does not get the confirm that the truck is good to go, and illuminate the cluster indicators ( 4x4, and if 4L the Low Range lamps ).
There are 2 vacuum solenoids, one is 4WD one is 2WD ( to move the motor one way or the other ).
Start with checking for vac on the vacuum motor ( actually it is a diaphragm ). The pink line should have vacuum when in 4WD, the blue line should have vacuum when in 2WD. If not, time to work back towards the solenoids. Use a short length of hose on the vacuum solenoids, and retest.
If still missing vacuum on the 4WD solenoid, I would suspect it is bad, but best to test on the other side of it, to make sure the vacuum reservoir ( mounted behind the battery box ) is supplying vacuum to the solenoids.

This is just the most common cause, best to confirm with the 1st test above, to know if you should look to the trans case, or axle.

This is what the vacuum shift motor looks like on the front axle


These are the vacuum shift solenoids

Testimonial: "Thank you for your help.I was working on it this morning and found alot of moister in the vacuum shift motor. "