Question about 2005 GMC Sierra 2500HD 4WD

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2002 gmc hd diesal 4 wheel light blinks wont go in though . Started by going in at times but now wont go in gear at all

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  • 36 Answers

The incoder on the side of the transfer case needs to be replaced. Check with GMC - they have had a lot of problems with this!

Posted on Apr 19, 2009

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Posted on Jan 02, 2017

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1 Answer

2005 GMC yukon xl slt transfer case drops out of 2 wheel hi but will work in auto 4 wheel


There is a transfer case control computer in the dash on the left side around the headlight control,they will cause the blinking lights and not shifting.

Mar 30, 2014 | 2005 GMC Yukon XL

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My 2002 gmc yukon slt wont switch out of auto fwd? It was working fine in 2 hi then i switched it to 4 lo the light on the 4 lo started blinking while it was still blinking i accidentally hit the auto...


You need to replace the lockup servo mounted in the front differential housing. the light will blink to indicate that the lockup servo is not engaging/disengaging. you can get the servo at a local parts place. It is very easy to replace and is easily accessible.

Mar 23, 2011 | 2003 GMC Yukon

1 Answer

My 4 wheel drive wont work. i will try to put it in and the light will just blink and it wont kick in to 4 wheel drive. how do i fix this?


You need to have the gears synchronized, this is right out of the manual that came with your blazer. If your light blinks and does not go in 4HI and 4LO, then the gears are out of sync. And should not go into anything but 2HI

Feb 19, 2011 | 2002 Chevrolet Blazer

1 Answer

Won't go into 4 wheel drive and says "sevice 4


I have this problem too, from time to time, it won,t act up for the dealership, when the service message is on I can shut the truck off and come back later and the hubs have turned in and the service light is off and the 4 wheel is fine, it is a '07 gmc 2500 hd

Dec 27, 2010 | 2007 GMC Yukon

1 Answer

It started with pulling 4 wheel drive lever to engage 4 wheel drive.It would take couple of seconds to engage.Finally engage light would appear showing engage.The light would blink a few times before...


Check the linkage under the vehicle that goes from your shift lever to a rod that then goes to the transmission lever. Sometimes a coupling will come loose. Simple return it to its' original position and re-tighten. Let me know if this helps. Thanks.

Dec 22, 2010 | 1995 GMC Suburban

1 Answer

2005 gmc sierra. Manual shift 4wd. After using


When you are finished with your 4 wheel drive,put the transmission in neutral, disengage 4 wheel drive and shift to reverse then back up a couple feet before shifting to forward gear.

Jan 15, 2010 | 2005 GMC Sierra

1 Answer

2001 gmc jimmy keeps kicking into 4 wheel drive


the 4 wheel low light will usually only blink because the low gear is meant for a very slow speed and usually wont activate with the vehicle in motion i would have to say the sudden switch to 4x4 though would probably be a short in the wiring some place

Nov 11, 2008 | 2001 GMC Jimmy

3 Answers

4 wheel drive lights


are you setting still or driving when ingaugeing the 4 wheel drive if you are setting still try putting it in with vehicle moving if it does not light up steady in 4wd then it is not going in 4wd

Oct 24, 2008 | 2001 GMC Jimmy

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