Question about 1999 GMC Sierra

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4wd will not engage in 4HI, 4LO or Auto 4WD

Truck goes into 4WD and the shift motors work, but when i was stuck on ice, the only thing spinning was my rear tires.

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Most of the engine power is designed to go to, the back wheels UNLESS the transfer case is in LOCK position in 4 hi or 4 low..also was the front hubs locked in...some models still use lockouts in front..remember this also.. if most of the weight is up front as it is on pickups, the rear wheels are the least resistance for the power so they will move first unless thers enough weight on top of them say sandbags or firewood or just dead weight...(if the truck is used look under the vehicle to see if the front driveshaft was taken out..some folks do this for fuel economy purposes) good luck repost findings please...thnx

Posted on Jan 19, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: service 4wd light

what causes the 4wd to kick in when you have it in 2wd

Posted on Apr 05, 2009

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Related Questions:

1 Answer

How do I fix my 99 blazer the dome lights won't turn on and the 4 who drive won't light up or work


In the instrument panel fuse box fuse # 8 CTSY LP 10A ,that's for the dome lights, fuse panel is left side of IP. What are you talking about 4 who drive won't light up or work ? 4 wheel drive ? Do you have two speed automatic or two speed selectable ?
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Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
The transfer case shift control module flashes each indicator lamp after a shift has been requested and will continue to flash until the transfer case shift control module can complete the shift. After a shift to AUTO, 4WD, 2HI, 4HI, or 4LO is made, the transfer case shift control module will flash that indicator lamp until the transfer case shift control module receives a high voltage signal on CKT 1695 from the front axle switch.
A solid state circuit located inside the switch supplies ignition voltage to the lamps. The solid state circuit also receives voltage whenever the headlamp switch is in park or headlamp position. When the solid state circuit receives voltage from the headlamp switch it will reduce the voltage that it supplies to the indicator lamps, dimming the lamps when the headlamps are ON.

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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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