My 2006 Hummer H3 is not coming out of 4wd lock position. The indicator light says its in the normal 4wheel drive but it doesn't feel like that when I'm making a hard turn (into a parking space) I tried driving in reverse as well as letting it sit in the garage overnight where its above freezing temperatures. What else could it be?

The Borg Warner (BW) model 4493/4494 NR4 transfer case is a 2-speed, full-time 4WD, transfer case. The transfer case has an external planetary type differential, which has 2 different sets of pinion gears. The planetary differential provides a 40/60 torque split front/rear full-time. This means the front and rear propeller shafts are constantly being driven for maximum traction in all conditions. A high/low planetary carrier assembly provides the high and low ranges, which is a 6-pinion gear, sun gear, and annulus gear arrangement, giving a 2.64 low range reduction ratio in the BW 4493 and a 4:1 ratio in the BW 4494.

either a small electronic issue or some physical problem with 4 wheel drive, plz see a qualified mechanic

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Could be in 4x4. Also does it have a limited slip front axle? If it bucks and pops like its in 4wd, could be a problem there. Could also be a problem with one of the drive shafts going out to the wheels. Hope that helps. Oil change in the front diff will tell you a lot more, and relitavily cheap.

Hummer 4wd service light reset Questions & Answers - Fixya

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Hummer h2 2003 55000 mill ... service 4wd the liht is on all time Remote the battery wire from the car for 20 ... My 2006 H3 will not come out of 4 wheel drive?

It doesn't take long to learn when and how to use your truck's 4WD system. Follow these steps and you'll feel confident about engaging the system the next time you need to get out of a slippery situation.

For a conventional system, where you can select 2WD or 4WD, the instructions refer to engaging 4WD. For trucks with permanent 4WD, they refer to locking the center differential.

Time Required: varies
Here's How:

1. Refer to your owner's manual to find out how to engage your truck's 4WD mechanism.
2. When driving in snow, mud, or just going off road, shift into 4WD when you get ready to leave solid ground. If you have lockable front hubs, lock them for those operations.
3. For severe conditions, use low range if available. Before shifting into low range you must either stop or slow down to at least 3 mph to prevent grinding gears.
4. When you return to normal conditions, shift out of 4WD or unlock the center differential. If the shifter doesn't want to move from 4WD or the differential lock stays engaged, don't panic, becaue the problem is normal and is caused by pressure on the gears.
   
   • Try backing in a straight line about 10 feet and try to move the shifter again.
     
   • If the shifter still won't move, try backing in an "S" pattern while trying to move the shifter.
5. If you have lockable hubs, don't forget to unlock them when you return to dry pavement.

Tips:

1. Vehicles with permanent 4WD are set up for everyday driving, but not necessarily for maximum traction on slick surfaces. Engaging the differential lock increases the vehicle's traction capabilities.
2. Do not operate a locked 4WD on dry, hard surfaces. Doing that could cause damage to the driveshafts, differentials or transfer case.

What You Need:
Owner's Manual

Good luck and remember to rate this solution.

Thanks for using Fixya.

Hummers are 4WD all the time, you can never take it out of 4WD. Now, you can select between locked 4WD HIGH and locked 4WD LOW. Those are switched by putting the vehicle in Neutral, and pushing the button the dash, waiting till the correct indicator light illuminates and then putting the truck in drive. Based on the above info, what exactly kind of 4WD drive problem are you having?

just adjustment on the shift

when driving in 4wd engagement there is a problem in that the torque in the axles and drive lines is not dissipated on hard surfaces as the wheels cannot slip ( great for snow ice mud gravel and the like but a no-no on hard non slip surfaces
yes reversing it will relieve it but if on hard surface ,winds it up again in reverse
better to simply drive two wheels onto the grass verge of the hard surface and then kick it into 2wd
if the diffs are limited slip diffs then the antislip action in the diffs will be pressed very hard together and will produce problems on turning corners
you may have success if you get all 4 wheels of the ground on a hoist and let the wheels spin and then try to engage 2wd