Question about 1999 Chevrolet Silverado 1500

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97 GMC Z71 4X4 Not Locking in

On my 1997 K1500 GMC Sierra Z71 when I try to put it into 4 high or 4 low it doesn't lock in the light just keeps blinking until it kills my battery. Works fine in 2 high lights in push button works but just doesn't lock in somebody please help!!!

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If it's a shift - on - the - fly 4wd, then call your local Chevy truck dealer. There was a recall on the Electronic 4wd on these trucks. (common problem). Try this just for the heck of it. With the truck stopped, put in 4hi/lo, then put it in reverse. Back up slightly, (about 5ft or so) and then put it in drive (or first in a manual trans) and go forward. Did it lock in? If it locks in but won't unlock, try backing up to unlock. Hope this helps.

Posted on Jul 26, 2009

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The actuator on the front differential is most likely not coming in. Test for current at it's electriacl plug. If it has current there the actuator isn't working. This is a common problem on your model. Actuator is over $100. So test first.

Posted on Jan 16, 2010

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I have a 97 gmc truck and i was in 4 lo and pushed in 4 hi and and took off on the highway thinking it was in and it didnt go in to 4 hi and instead it was blinking but by the time i seen it ,it was in 4 lo still and not 4 hi and it was over reviving the motor at 55 when i realized it,it was to late and i threw 3 rods thru my oil pan because it didnt shift. so u need to be careful and it cost me 2000.00 plus .

Posted on Jan 10, 2010

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Posted on Jan 02, 2017

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Sep 10, 2015 | Cars & Trucks

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97 GMC K1500 4x4 not locking in/ blinking lights


When it is in 4x4 check and see if you can turn the front drive shaft. If you can the problem is in the front end. If you can't the problem is in the trasfercase.

Mar 24, 2017 | 1997 Chevrolet K1500

1 Answer

My 1997 gmc sierra shows four high light blinking but it will not lock in and my four low does not blink or lock in. What is the problem? The fuse isn't blown.


The first thing i would do is drain and refill the transfer case with clean DEXRON VI ATF, this may free up the case clutch and allow it to operate. It is worth a try. the drain and fill plugs are on the back of the case.

Jul 12, 2012 | 1997 GMC Sierra

1 Answer

I have a 1997 gmc pickup with 4-wheel drive. The


You probably have blown drive hubs. Do you have to engage the hubs at the wheels? If not and they are automatic locking and they are probably blown or seized into the unlock position. They are not too expensive to replace with manual locking hubs (My Suggestion) but the autolocking hubs are expensive. When you take the caps off the front drive spindles and try running it again you may see the axle turning inside but not the wheel. That is the best test. Wish you luck!!

Jan 05, 2010 | 1997 GMC Sierra K2500

1 Answer

MY 97 GMC 4 LOW LIGHT IS FLASHING IT WILL NOT COME OUT OF 4 LOW. I HAVE CHANGED THE CONTROL MODULE, AND PUT A NEW TRANNY IN. WHEN I SHUT THE KEY OFF I HEAR THE RELAYS CLICKING IN THE CONTROL MODULE AND THE...


when you replaced the module did you notice any corrosion in the connector green powder
also check the connector at the encoder motor
high resistance in the wiring will cause it not to get the right information
if the wiring is good try a switch
hope this helps you
good luck let me know


Nov 12, 2009 | 1997 GMC Sierra

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