Question about 1999 Chevrolet K2500

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My transfer case won't engage. When I press the button I can here the motor try to engage, but it just goes back into 4HI. I've replaced the actuator and the transfer case motor. It is model 243 transfercase.

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  • jeffnobleone Dec 29, 2010

    Last year the same thing happened and I disconnected the actuator and transfer case motor and reconnected them and it worked fine, for 10 months. A couple of months ago it would go into 4 LO when I was in nuetral. Now the I can here the motor try when I'm in gear but when I'm in nuetral I can hear it try and the transfer case makes a (clunk) sound. Also, when I hit the button I hear a (tic-kity-tic) sound from the fuse block under the dash. I drained the fluid and replaced it. This summer I think the 2 HI button was flashing once and a while when I was driving.

  • jeffnobleone Dec 30, 2010

    If was a slippage problem wouldn't it engage and not work?

  • jeffnobleone Dec 30, 2010

    Where can I find this product, I tried Advance, Oreilly and Auto Zone.

  • jeffnobleone Dec 30, 2010

    My problem wasn't solved. But, it sounds like it might nto be solvable.

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  • Chevrolet Master
  • 76,109 Answers

Hello
The first thing to do here is drain and refill the transfer case with fresh GM type DEXRON VI transmission fluid, it may just be stuck, there is a drain and a fill plug on the case.

Posted on Dec 28, 2010

  • 3 more comments 
  • yadayada
    yadayada Dec 29, 2010

    Transfer cases have a special type of clutch in them, it can hang up/stick if the fluid is not changed on a regular basis, the fluid contains special chemical fiction modifiers that aid in smooth operation of the case, please change the fluid as I've recommend and then every 30,000 miles thereafter. Use fluid type DEXRON VI, add a 1/4 bottle/tube (or 2-3 ounces) of STA LUB brand friction modifier (I have found this brand works best) as well, this is the same chemical used for Positraction rear ends, but it has many other benefits when used in Transfer cases and automatic transmissions for harsh shift issues or Torque Converter chatter on lockup.




  • yadayada
    yadayada Dec 29, 2010

    If the fluid change and additive don't cure the problem after a few miles of driving then you will need to have the Transfer Case rebuilt.

  • yadayada
    yadayada Dec 30, 2010

    Amazon.com has it.

  • yadayada
    yadayada Dec 30, 2010

    It has nothing to do with slipping, it is not the way the transfer case works, just change the fluid and add the additive as i instructed.

  • yadayada
    yadayada Dec 30, 2010

    You can't solve the problem until the work is done, since I can't do it over the computer i can only suggest solutions for any problem based on my40 years of repair experience. I provided you two probable solutions, one is the fluid issue, and the other a mechanical issue inside the case (worn or damaged parts), you always do the cheapest thing first, which is change the fluid. Most folks never change the fluid and this leads to problems of sticking like you have, so that may be the fix, no way to tell until it is done.

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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

My 1997 GMC Sierra lights for 4hi and 4lo blink when i push the 4hi button and then goes back into 2hi. but when i push 4lo it locks in and works fine. I tried changing the 4wd motor on the transfer c


THE TRANSFER CASE MOTOR IS ONLY FOR 4WD LOW. That would have never been the problem as soon as you confirmed it shifted into 4wd Low. 2wd and 4 Hi work off of vacuum. You may have one or two issues. A vacuum leak up by the front axle that engages the 4wd HI or the sensors on the transfer case.

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1 Answer

1996 chevy Z71 when I engage 4hi and lo lights on buttons flash


it means your transfer case is not engaging or front diff not engaging.should here a shifting noise under the floor .if not the shift motor is not working try tapping the motor and see if it works.poss water has rusted the connections or the motor seized.

Dec 21, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

Front axle does not engage. Push 4hi or 4lo button, transfer case motor engages front drive shaft, front diferential actuator extends, but no 4 wheel drive. What do I check next?


There may be vacuum lines running down to the hubs. If so check them for vacuum when engaging and dis-engaging 4 wheel. If you can't feel any vacuum, trace lines, and check for leaks.

Dec 13, 2010 | 2002 Chevrolet Silverado 1500HD

1 Answer

4x4 push button is not working about how much does


This is something you can do yourself if you have ever worked on a vehicle before. The part you need is called a front drive actuator valve. It costs about $ 50.00, GM part # 15165891.
Here is some more infor about it:

Main 4wd Components:
TCCM
- Transfer Case Control Module - Located behind the glove box. This is the electronic 'brains' behind the shifting.
Switch - The push button switch in the dash - driver input/indicator.
Encoder Motor - Located on the transfer case - This is what actually shifts the transfer case, and tells the TCCM what position it is in.
Vacuum Switch - Also located on the transfer case - This is what sends vacuum to the vacuum actuator (see below) when the transfer care is in 4HI or 4LO.
Vacuum Actuator - Located under the battery tray - This is what engages or disengages the front driveshaft.
Front Axle Switch - Located on the front axle - This is what tells the TCCM when the front axle is engaged.

If you want to try and replace it yourself, please let me know how it goes.

Feb 11, 2010 | 1998 GMC Jimmy

1 Answer

I have a 1995 Silverado 4x4. The 4WD will not engage. Someone told me it may be the actuator for the transfer case. When I try to shift into 4hi, nothing happens. When I try to shift into 4lo, it grinds...


I HAD A BLAZER WITH THE SAME SYMPTOMS REPLACED THE TRANSFER CASE MOTOR AND SOLVED PROBLEM. TRANSFER CASE MOTOR SHIFTS FROM HIGH TO LOW GEAR IN THE TRANSFER CASE AND TELLS THE FRONT ACTUATORS TO INGAGE FRONT HUBS . MOTOR WON'T MOVE TO 4 HIGH AND GRINDS WHEN TRYING TO MOVE TO 4 LOW, TRANSFER CASE MOTOR FAILING . CHECK VACUUM LINES AND ACTUATORS ON FRONT DIFF THEY FAIL, CAN CHANGE TO CABLE ENGAGEMENT INSTEAD OF FAILURE PRONE VACUUM ACTUATORS.

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1 Answer

02 dakota wont shift from 4hi to 2 hi


Try commanding the drive ranges while in netural cycling them. This may normalize the controller that senses the position from the encoder motor assembly. There maybe a procedure for that in a service manual.

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1 Answer

94 Sonoma 4x4 won;t lock into 4WD.


yea its not shifting again like before ? sounds like your transfer case solonoid has possably gone bad again .. these are a sometimes dont work item .. It is what shifts the transfer case into gear and it might be a little worn or weathered and not letting the switch kick it in gear all the way from the N position. thanks Jerry holler if you need more.

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1 Answer

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

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