Question about 2001 GMC Sierra 2500HD

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Transfer Case Binding Up

When engaged in 4Hi the transfer case will bind and lock up the front wheels. Have to back up to unlock it and go again and locks up. Works and drives fine in 2Hi.

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  • bigharvo_75 Jan 22, 2009

    k thanks i will check into it

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  • Master
  • 1,990 Answers

You have a Bad Gear in the Transfer Case. This will require a Rebuild to fix.

Posted on Jan 22, 2009

  • Travis Humphries
    Travis Humphries Jan 22, 2009

    No Problem! Happy to Help!

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1 Answer

4 wheel drive won't engage


Which do you have ?
Transfer Case - NVG 236 (Two Speed Automatic)
Transfer Case - NVG 233-NP1 (Two Speed Selectable)
The NV236 transfer case is an automatic transfer case with three drive ranges. Shifting from rear wheel drive to four wheel drive is done automatically when the transfer case shift control module receives wheel rotating slip information from the speed sensors. The transfer case shift control module then engages the transfer case motor/encoder to position the transfer case from rear to four wheel drive. When the transfer case shift control module receives information that the wheel rotation is the same on both axles, the transfer case shift control module sends position information to the motor/encoder to put the transfer case back into rear wheel drive. The three drive ranges are 2HI, 4HI, and 4LO. The 2HI position is for normal driving with the rear wheels pushing the vehicle. The 4HI, position is for driving through sand, snow, mud, gravel, or heavy rain at normal or slightly below normal speeds. The 4HI engages the front axle to allow for four wheel drive. The front axle is pulling the vehicle, and the rear axle is pushing the vehicle. The 4LO range is used for off road driving, heavy snow, deep mud, or shallow fording. The 4LO is similar to the 4HI except that the gearing in the transfer case is set for low speed and high torque. The NV236 is manufactured at Syracuse New York by New Venture Gear a division of New Process Gear for General Motors.
Is the switch light on or flashing ? If you have automatic 4x4 there are several DTC'S that can set >
DTC B2725 ATC Mode Switch Circuit Malfunction DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0323 T-Case Lock Circuit Low DTC C0324 T-Case Lock Circuit High DTC C0327 Encoder Circuit Malfunction DTC C0362 4LO Discrete Output Circuit High DTC C0367 Front Axle Control Circuit High DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0387 Unable to Perform Shift DTC C0550 ECU Malfunction DTC C0611 VIN Information Error

Dec 01, 2015 | 2000 Chevrolet S-10

1 Answer

How do I get it to go into 4WD?


so what are the symptoms.?????????????????
what transmission, A/T or M/T?
you get on the dirt. and shift to 4Hi or 4low (its not for DRY pavement) so... AWD started in 2004, so is not AWD. but PT.
called Part time four wheel drive.
are you getting ready for snow , that it? do say so, as telling the job puts us on the same page...

and 4wd does not engage?
this system is just Part time 4wd,. and is for ice roads or dirt only.
the first test is the transfer case not front axle.
test 1:
when you select 4HI the gear dogs in the transfer case lock.
and not power goes to the front prop shaft,
with all 4 wheels on jack stands this can be felt key off.
or running in 4wd.
key off , and A/T in PARK or 5speed stick in say REVERSE
you can not turn the front prop shaft by hand, in 4H wheels off ground, that means the transfer case is in fact in 4hi.
Ok we now have POWER To the front axle. (following me;/??)
so the front axle locks.
if the front , fails to lock, up, at spec pressure then the part 18 is bad (spec is 4.25 PSI)exactly.
http://www.fixkick.com/axles/04lock.JPG
if on the other hand the pressure is low, then this is bad
part 25 pump i s bad.

http://www.fixkick.com/hubs/F-axle-99up.JPG


easy huh>?

or is the only symptoms just the dash light.
as driving on pavement dry, (no ice) its normal for the dash light to fail. after all you dont belong in 4wd now. lacking ice or dirt.
but if you jack car up in air, sure the light must come one.
the light dont come on until the transfer case fully engages.
and cant if on dry ground and it binds up, as ALL DO.
get on dirt.
shift to 4wd, going dead slow, 1/2"mph slowest possible speed.
this saves DOG DAMAGE. in the box.

http://www.fixkick.com/part-time-test.html#Suzuki_PT


no,sorry, the PCM has Zero to do with the manual transfer case.
please say , what fails (besides the useless dash light)
what are you doing?
where is car, what surface are the tires touching?>???
do not drive this car on dry pavement (means no ice)
in PT 4wd.
its not for that. sell car buy 2004 with AWD.
if you know all that, as the operators guide says.
then do the prop shaft test .wheels off ground.
and say what transmission you got here,
i have 4 cars like this all are 5 speed box.

see the dogs here.
see red arrow. see words weak.?
http://www.fixkick.com/tranny/xfr-case/XFRCASEGUTS.jpg

when you shift to 4H, this dog engages and the chain moves.
and the front prop shaft moves with full power.
that is test one, engage this dog and test.
the dogs are the small teeth on gear #29

Sep 16, 2015 | 2001 Suzuki Grand Vitara

1 Answer

4 high won't engage but 4 lo and 2wd work fine


Check for power to the front differential actuator. This actuator slides a gear in position to lock the differential to drive the front wheels. If you have power and ground to the actuator when in the 4HI position, the actuator has gone bad.The 4LO is only engaging at the transfer case, but the front wheels are still not engaged if it is not working in 4HI.

Feb 25, 2015 | 2003 GMC Sonoma Extended Cab

1 Answer

1995 GMC Sonoma will not switch back out of 4 high?


Are the front hubs still locked in?

If you have manually locking front hubs, you probably have a bit of binding in the drive train due to the front wheels being locked to the drive system

After unlocking the hubs, back up about 20 feet, then back forward about 20 feet.....see then if the transfer case can then be disengaged. You MAY need to just yank on the transfer case shifter while the vehicle is moving (slowly of course).....

I had an older ford pickup which did the same thing.....disengaging the hubs and just yanking the shifter had disengaged the 4 wheel drive then I was able to put it back into 2wh high.

Feb 28, 2011 | 1995 GMC Sonoma

1 Answer

2001 Dakota: four wheel drive will not engage and windshield wi...


4x4 issue could be either the TCCM Transfer Case Control Module, or the transfer case shift motor.

When you turn your dash switch from 2wd to 4HI, can you hear the shift motor underneath operating?

May 17, 2010 | 2001 Dodge Dakota

1 Answer

The front wheels on my 2000 gmc jimmy will not lock in 4hi or 4lo


In addition to transfer case engagement via an actuator on the "T" case there is a front axle actuator. On my Blazer which I'd bet is very similar.. There was a vacuum diaphragm under the battery which operated a cable to "lock in" front axle. make sure you have vacuum supply when asking for 4 wheel operation and make sure cable is not seized. If this checks out o.k. back to transfer case. your question asked about front wheels locking so I assumed your "T"case was working

Feb 19, 2010 | 2000 GMC Jimmy

2 Answers

Is it right for your front drive shaft to turn by hand when in park


i'm assuming you have a 4 wheel drive. If that is the case then yes cause when your in two wheel drive mode the front is in neutral

Oct 16, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Why would all the lights come on my 4 wheel drive buttons about ten minutes after i start the truck


My 2003 Silverado has done this several times. This happens (at least on my truck) when I switch from any other mode to 2H when the truck is not moving. The front hubs are locked in the engaged position (actually, it locks inside the front differential) when in 4HI, 4LO, or Auto-Trac. When switching to 2HI, the front hubs try to unlock. The mechanism may bind, especially if they haven't been used for months, like during the summer, and don't completely move to the unlocked position. A switch tells the controller when unlocked, but doesn't always get triggered when the hubs don't get completely disengaged. Usually cycling between 2HI and Auto-Trac while driving will free up the hubs and make prevent the problem of all 4 lights coming on at once. Turning the engine off and then restarting it will usually correct the problem with all 4 lights lit at the same time by resetting the transfer case controller. Then, you will be able to switch from 2HI to Auto-Trac and back to 2HI while driving, as described above, to free up the mechanism. If this doesn't fix it, you will likely have to replace the switch in the front differential that tells when the hubs are completely disengaged, or, more likely, the motor that disengages the hubs/drive axles in the front diff.

Jul 16, 2009 | 2004 Chevrolet Silverado 2500HD

1 Answer

Will not switch between four wheel drive and two wheel drive.


DID YOU CHECK THE MOTOR IN THE FRONT AXLE AS WELL AS THE ONE IN THE TRANSFER CASE GOOD LUCK

Dec 31, 2008 | 1994 Chevrolet S-10 Blazer

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