Question about 2000 GMC Sonoma Extended Cab

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1996 sonoma when i shift into 4hi or low light comes on but front wheels wont engage. But the transmission does. any help to solve this problem

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Check the fuse to the 4x4, if the fuse is good then check the 4x4 electric motor actuator on the transfer case. You should hear it work from 2wd, 4hi to 4low and back to 2wd with the push of the switch. if you don't hear it working then check the wire harness at the actuator motor, look for any damages like corrosion or cracked wire connector clips. If the 4x4 actuator is working on the transfer case, then the front hub 4x4 actuator may have gone bad and that's located on the front differential. It's common for the clip there to corrode and break and is an easy fix with a new collar pin, at worst it's the diaphragm on the vacuum actuator that is located under the battery tray. There is a vacuum switch on the top of the transfer case, driver side but when that fails, your front hub stay's locked in the on position. Good luck and keep me posted and hope it's a simple fuse that has gone bad. You can pick up all these parts at Auto Zone or Parts Source and they will have the step by step instructions for you to get the job done with common tools.

Posted on Dec 10, 2009

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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.
if on the other hand the pressure is low, then this is bad
part 25 pump i s bad.

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.

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.?

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

How to properly engage and dis-engage 4 wheel drive 0n 1996 gmc sierra

  • Shifting from 2HI to 4HI Press and release the 4HI button. This can be done at any speed, and the front axle will lock automatically.

  • Shifting from 4HI to 2HI Press and release the 2HI button. This can be done at any speed, and the front axle will unlock automatically.

  • To shift from 2HI or 4HI to 4LO, the vehicle must be stopped or moving less than 3 mph with the transmission in NEUTRAL

  • Hope this helps.

Oct 29, 2011 | 1996 GMC Sierra

3 Answers

How do i put my 4x4 on my 95 yukon......on park or neutral. and do i have to put my foot on the brake?

You can shift between 2Hi and 4Hi when the truck is moving. Just let off the gas and shift it. But in order to shift to Neutral or 4Lo you need to stop the truck and shift the transmission into neutral then shift the transfer case.

Dec 06, 2010 | GMC Yukon Cars & Trucks

1 Answer

4 lo working, 4 hi stopped working , A4WD never worked

Hi my name is Juan and I do own a trailblazer with the same year 2002 and I read the problem you have let me try to help you Have you try to shift to 4hi with your transmission in neutral ? the transmission needs to be in neutral in order to shift the transfer case to 4hi and the vehicle needs to be completely stooped also is your service 4wd light on?? if the light is on your transfer case needs service and it can be as simple as the switch inside your car or a solenoid that has not been detected by the computer

Mar 30, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

4 wheel drive

i own a 1996 and it's manual says you can shift on the fly with no problem.........if there was a noise accompanying the shift to 4hi i would be concerned but if it just went in and you were able to shift it out with no problems i would not worry
hope this gives you a little peace of mind!

Jan 10, 2009 | 1997 Chevrolet Tahoe

2 Answers

2000 gmc yukon xl 4x4 wont engage

try replacing decoder module on transfer case they are known to go bad causing same problem.

Jan 02, 2009 | 2000 GMC Yukon XL

1 Answer

1996 GMC Sonoma

the front diff. is engeged by a thermal acuator in the front center section. check that the wiring on the pass. side of the front axle is of, if so the the acuator is probably faulty. Best to get an aftermarket posi-locking shifter if you need to replace the thermal unit.

Sep 13, 2008 | 1996 GMC Sonoma

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