Question about 1997 GMC Sierra

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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

I also have to have the truck in neutral to even get the lights to blink when I hit the 4hi button. This was not the case when everything was working properly.

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  • Contributor
  • 39 Answers

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.

Posted on Nov 22, 2013

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Posted on Jan 02, 2017

countrysi248
  • 443 Answers

SOURCE: 94 Sonoma 4x4 won;t lock into 4WD.

yea its not shifting again like before ? sounds like your transfer case solonoid has possably gone bad again .. these are a sometimes dont work item .. It is what shifts the transfer case into gear and it might be a little worn or weathered and not letting the switch kick it in gear all the way from the N position. thanks Jerry holler if you need more.

Posted on Feb 05, 2009

jmwmusic
  • 3 Answers

SOURCE: I have a 2001 GMC Sierra Pickup that has

fullyjr.

Engaging from 2WD - 4HI/Lo requires movement of the vehicle. very low speed under 5mph, push button should engage. the vehicle has to be moving.

Posted on Feb 07, 2010

  • 52 Answers

SOURCE: 1997 GMC Yukon 4-wheel drive electronic

Dave,
The problem your are speaking about could be a few things. All things that are somewhat common to go bad on Chevys/GMCs. Each one of the cars I worked on had a different problem. I have changed the switches, the 4wd solenoid, and TCM on different trucks. IMO the TCM location in the passenger kick panel is a poor location allowing water and other passenger debris to get into it. Once water gets in that area you can imagine already what occurs. One of the cars the TCM bracket was rusted by the ground and eventually the weak ground fried it. The weird thing is the TCM would allow it to shift sometimes and not other times or partially engaging causing the wonderful light to blink rapidly. What I have found of some time with these trucks is pushing the button to change the truck to two wheel drive and driving a few feet in reverse helps ease the change.

So you can start with a new switch that pops in and out of the dash in a few mins. Can get one on ebay for under 25 dollars. Although, I personally would take off the kick panel and take a look at the TCM. If you see any rust around it, my money would be on that.

Good luck

Posted on May 26, 2011

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