Question about 1994 Chevrolet S-10 Blazer

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

I replaced the motor. The lights just blink but the 4hi light stays on but is not in 4 high. transfer case is engaged in 4hi but the front axle is unlocked. Motor was turning but is not now.

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  • Anonymous Jan 01, 2009

    no lights on 4wd indicator will not lock in front end

  • Anonymous Feb 17, 2009

    exact same problem in my 1997 silverado

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

Posted on Dec 31, 2008

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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

2007 chevy trailblazer won't go into 4 wheel drive


Have you had codes checked ? While connected to a good scanner that will check transfer case switch to show if switch is working, and it could be the switch on the side of the transmission.

Feb 10, 2014 | Cars & Trucks

1 Answer

1997 GMC Yukon 4-wheel drive electronic switch type. When the truck is cold the truck will go from 2hi to 4hi. When the truck is cold the truck will go from 4hi to 4lo. When the truck is hot or warm...


Dave,
The problem your are speaking about could be a few things. All things that are somewhat common to go bad on Chevys/GMCs. Each one of the cars I worked on had a different problem. I have changed the switches, the 4wd solenoid, and TCM on different trucks. IMO the TCM location in the passenger kick panel is a poor location allowing water and other passenger debris to get into it. Once water gets in that area you can imagine already what occurs. One of the cars the TCM bracket was rusted by the ground and eventually the weak ground fried it. The weird thing is the TCM would allow it to shift sometimes and not other times or partially engaging causing the wonderful light to blink rapidly. What I have found of some time with these trucks is pushing the button to change the truck to two wheel drive and driving a few feet in reverse helps ease the change.

So you can start with a new switch that pops in and out of the dash in a few mins. Can get one on ebay for under 25 dollars. Although, I personally would take off the kick panel and take a look at the TCM. If you see any rust around it, my money would be on that.

Good luck

May 26, 2011 | GMC Yukon Cars & Trucks

1 Answer

My four wheel drive is not working. i replaced the switch on the dash. tried it and all it did when i hit 4-hi both 4-hi and 4-lo blink a few times the it goes back to 2 wheel drive. it did stay in 4-hi...


It's the transfer case motor.I had the same problem exactly and replaced, now it works great. Part is about $100.00 ( aftermarket ) .Ifyou are going to replace yourself you will have to remove front drive shaft and remove yoke from transfer case with an impact wrench for clearance to remove transfer case motor . When you put the new transfer case motor in make sure you line up slot with grove in transfer case motor. Good Luck.

Jan 03, 2011 | 1997 Chevrolet Blazer

1 Answer

My 98 trooper doesn't seem to have four wheel drive, the dash light blinks, but it doesn't seem to spin all four in the mud so I can't tell if its working, does this light just blink? Or should it stay...


I belive that it should stay constentley light. Try to put it into 4 wheel drive. Put it in reverse back up about 10' Put it back in drive and see if it works...Best of luck

Nov 30, 2010 | 2000 Isuzu Trooper

2 Answers

My 1999 chevy silverado 1500 four wheel drive won't engage. The truck is in 2wd now. When I push 4wd hi or low, I can hear the actuator try to engage the four wheel drive. The four hi or low button will...


You probably have a bad encoder motor.It is located on the side of the transfer case on the drivers side.It is black.The other problem they had with these was the switch but you have already replaced this so your next thing is the encoder motor.Hope this helps.Good luck.

Dec 28, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

1992 chev blazer tahoe lt.. 4 wheel drive worked last year. Tried to engage it this year for first time and would not go into 4Lo or 4Hi. Was in neutral. Start vehicle and green light on 4wheel option...


not a fuse if you have power to switch,if your 4wheel light does come on and is not blinking,check the little motor on the transfer case,tap it while someone tries the switch,it might just be stuck from not being use,if it doesn't free its self you may need to replace it.

Dec 26, 2009 | 2001 Chevrolet Tahoe

2 Answers

Jimmy wont lock in four wheel drive.


You need to see if the transfer case engagement motor is defective.

Nov 21, 2008 | 1999 GMC Jimmy

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