Having problems with your 1999 Chevrolet Silverado 1500 ?

97 GMC Z71 4X4 Not Locking in

\015 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!!!\015 Posted / edited by AnonymousUser on : 23-04-2018

Answers :

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.
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.
Repair Help & Product Troubleshooting for 1999 Chevrolet Silverado 1500

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