Question about 1999 Chevrolet Silverado 1500

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4x4 wont work

Push button four wheel drive wont engage front wheels put in in 4 hi and light switches on and can feel the transfer case lock in , I checked front axel solenoid and its good.If you could tell me what else and how to check it would be greatly appreciated.

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  • bigglug Mar 14, 2009

    sounds like fork in front diff is broke light comes on and actuator works?front shift fork is broke or stripped

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If you can have the codes scanned in your vehicle it would be very helpful to you. If you have a code for the encoder motor sensor or the encoder motor itself on the side of the transfer case, this is where i would begin, quite common with the push button 4 wheel drive. Thanks for using fixya!! good luck

Posted on Mar 15, 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

2 Answers

Every time i push the button for the four wheel hi it makes the click noise in the front but DOES NOT ENGAGE. only the back tire spins


Depending on the year, it is not posted, it may be a bad transfer case motor. The clicking you are hearing is the motor trying to engage transfer case & front axle. It looks like a windshield wiper motor & when it gets power & works properly it engages front wheels. Again, depending on the year, may be 4 wheel drive actuator or switches bad on front axle or transfer case.

Jan 17, 2011 | GMC Jimmy Cars & Trucks

3 Answers

My 2000 gmc jimmy 4x4 stoped working. It wont go into 4 hi. the vacume pump under the battery is good. can hear and feel the motor switch from 4 low to 2 hi. any ideas? Is there a code reader for this...


Hi, it sounds like your front diff engages but your transfer case is not. raise one of your front tires off the ground and see if it will lock up when you go to 4hi. If it does then the problem is your encoder motor that hangs down under your transfer case.

Aug 21, 2010 | 2000 GMC Jimmy

1 Answer

95 nissan 4x4 truck. four wheel drive light comes but does'nt en


the front axles have pinon gear box that the shaft from the transfer case goes to, it has a vacuum hose to it or a solenoid actuator check these for proper function this is how the power is turned on to the wheels.

Feb 13, 2010 | 1990 Nissan Hardbody King Cab

1 Answer

1988 ford ranger push button four wheel drive an it wont engage all the wires are good it just clicks when u push the button.. what should i look for to make the four wheel drive work again it wont...


Start out with buying yourself a $25 book from the Parts House. The I would go to the front HUBS, secure & safety vehicle before you do anything, Clean, Inspect, Lune & Repair front Hubs as required, get the brakes while you're there. Check your drive line, axles, u-joints etc. Clean , repair , replace as needed. Check for Tranfer case Operation. Is there power going to the front Axle when 4WD is engaged? do you feel a change when you engage the Transfer Case? Have you checked the Power on the circuits? Have you Manual or Auto-locking Front Hubs? Answer all those Questions & read before you do anything.

Nov 03, 2009 | 1988 Ford Ranger

1 Answer

4x4 wont engage front wheels


check switch or sensor on transfer case

Mar 06, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

4x4 wont engage


the motor on the back of the transfer case may be stuck knock on the motor lightly with a hammer when switching the the switch May need a motor

Mar 03, 2009 | 1999 Chevrolet Silverado 1500

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