2001 Chevy S10 4x4. While driving in town, will engage in 4lo.. 2 hi just flashes. What could be causing this?

Jamie Holmes

Asked by Nov 19, 2015 at 02:28 PM about the 2001 Chevrolet S-10 2 Dr LS 4WD Extended Cab SB

Question type: Maintenance & Repair

I'm a girl, so please use terms that I can
understand. Its very random when this issue
happens, I know how to get it out of 4lo and
back into 2hi, but I'm afraid that it will
switch into 4lo while I'm driving on the
highway or something. The 4 hi works fine
when I engage it last I checked. Wondering
what could be causing this issue and if I
should not be driving it until it's fixed.

7 Answers


Sounds like either a switch or control module malfunction, unfortunately the only way to be sure is to catch it doing it with the test equipment in place. If you are concerned about false engagement you could just unplug the shift motor itself until you had the time to have it thoroughly checked out. see pic

1 out of 1 people think this is helpful.
Jamie Holmes

Ok, thank you very much!

Andrew Olsen

Even easier there is a fuse for the 4wd. It is labeled 4wd, pull it so it can't mess with you.

Jamie Holmes

So that just keeps it into 2hi at all times. Would hooking it up to a computer pick up the issue? Guy above said would only pick up if the issue happens while computer is hooked up. . Is there any other ways to check what the issue is?


No that is not what I said, there are a set of meters that need to be hooked up to the 4X4 system that can read voltages when the system is operating normally and abnormally, I don't know of any computer codes for the system on this rig for the 4C4 unit. Yes that means it will stay in 2 WD.

Jamie Holmes

Oooh, ok, I understand what you meant now. My bad. And thank you for the help


Just to let you know if you decide to do any of the above procedures you may or may not get a flashing light on the 4X4 panel, it maybe just one or it maybe all the lights, just don't be alarmed about it, it's just the system trying to get your attention that something is wrong with the 4X4. HTH

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