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Related GMC Questions
Can't get power from signal wire coming from the transfer
Can't get power from signal wire coming from the transfer case to the front diff on my 05 gmc … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
I have a 2000 GMC sierra. The front actuator engages the
I have a 2000 GMC sierra. The front actuator engages the diff whenever the vehicle is running. If I just turn it to 'on' and shift the 4wd lever, the actuator moves in and out as it should but as soon… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
Got a 2000 yukon xl. when tting the 4wd switch, it does not
got a 2000 yukon xl. when hitting the 4wd switch, it does not always switch from 2hi to 4hi or auto. could it something simple like the transfer switch or the 4wd switch? I am trying to sell this thin… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
I have a 2002 GMC Sierra 1500. The 4wd randomly quit
Hello. I have a 2002 GMC Sierra 1500. The 4wd randomly quit working. I have no service messages, the selector switches continue to work normally. I can hear and feel the truck switch from 2-4Hi and 4H… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GM Yukon: Hey I got 2000 gmc Yukon Denali it's stuck in 4low
Hey I got 2000 gmc Yukon Denali it's stuck in 4low n front wheels not locked in 4x4 just rear working in low front shaft not spinning to front rear but it's stuck in 4 low… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC Sierra 1500: 94 gmc sierra pickup. I have power to transmission
94 gmc sierra pickup. I have power to transmission switch but no power to the actuator when I shift to 4 wheel. high or low… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GM Sierra: I just picked up my father's 2001 Sierra 2500 hd,
I just picked up my father's 2001 Sierra 2500 hd, he wanted to plow his driveway one last time before I took it. Now it's stuck in 4hi. When I push the button for 2hi I here some clicking but it drops… read more
Pete
Pete
GMC Mechanic
General auto certifications
42,374 satisfied customers
GMC Yukon XL 1500 Denali: I recently took delivery of a 2015
I recently took delivery of a 2015 GMC Yukon XL Denali... The truck has 4Hi, 4Lo, Auto and 2 Does anyone know how the AUTO setting works? What does it do exactly? Is it similar to 2006 Denali AWD? Tha… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC Yukon Denali: Im working on a 2000 Denali. 4wd has been
I'm working on a 2000 Denali. 4wd has been working fine until last weekend. I used 4 Low but it wont come out of 4 low. I can hear the transfer case shift but it aparently doesn't make the full shift … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC Canyon Z71 SLE: Hi , I have a 1997 gmc z71 1500 . It wont
Hi , I have a 1997 gmc z71 1500 . It won't go intoXXXXX. Light blinks , can here transfer case shifting . Replaced front actuater , still the same . Also unhooked battery .HELP The truck has 159 000 K… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC Jimmy 4x4 (Mid Size): 99 JIMMY 4X4 ..VACUUM ACTUATOR WORKING
99 JIMMY 4X4 ..VACUUM ACTUATOR WORKING (CONFIRMED)(CABLE PULLS PROPERLY) , AXLE SWITCH NEW, TCCM WORKING .. ENCODER MOTOR BAD??? WHAT ELSE CAN IT BE ?? HAVE I MISSED ANYTHING (4 BUTTON SWITCH ON DASH … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC Sierra 1500 Classic SLT: I have a 2006 sierra 1500 slt.
I have a 2006 sierra 1500 slt. Lately I am having problems shifting into 4 h,i 4 auto and 4 lo when the vehicle is cold. Outside temp is below freezing. Drive for a couple of kilometers and it shifts … read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC Sierra 2500 HD SLT: I just bought a 2001 GMC Sierra 2500HD
I just bought a 2001 GMC Sierra 2500HD Ext Cab. It has the electronic mode and range selection for the transfer case (RPO NP1). My understanding is its a part time system and shift on the fly from 2HI… read more
Dave Nova
Dave Nova
GMC Technician
Associate Degree
929 satisfied customers
GMC Sierra 2500 HD Pickup: i have a 1990 2500 GMC seirra truck.
i have a 1990 2500 GMC seirra truck. theXXXXXworks up to the front axle. i just replaced theXXXXXactuator and still dont haveXXXXX the automatic hubs seem to be in good shape… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC Suburban K2500 4x4: I have a problem with transfer case
I have a problem with transfer case on my 1999 Gmc Suburban k2500. It has a np8 autotrac np 246 and 4l80e transmission. The rasfer case has been replaced with new remanufactured one and Im having seri… read more
Pete
Pete
GMC Mechanic
General auto certifications
42,374 satisfied customers
GMC S15 Jimmy: I have a 1999 S15 Jimmy. The Auto 4WD funtion
I have a 1999 S15 Jimmy. The Auto 4WD funtion works but the 4Hi and 4Lo will not engage. I was stuck and when in 4Hi or 4Lo under load a "whirring" sound eminates from the front end. Why would the aut… read more
Pete
Pete
GMC Mechanic
General auto certifications
42,374 satisfied customers
GMC Sierra 1500 Classic SLT: Ive been having intermittent
I've been having intermittent 4wd service messages. Then the other day I discovered my truck would not go into 4lo. Today while driving in 2hi all of a sudden my truck went into neutral and would not … read more
Hal
Hal
owner/service tech
Vocational, Technical or Trade Scho
925 satisfied customers
GMC Yukon XL 1500 SLT: I have a 2001 Yukon XL 1500 with the
I have a 2001 Yukon XL 1500 with the Autotrac transfer case (I think, it has the auto button on the dash). My question is should the front shaft be turning when in 2-HI? I started noticing a humming n… read more
Pete
Pete
GMC Mechanic
General auto certifications
42,374 satisfied customers
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Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

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GM Grand Master Technician 2007. 14 year experience.

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Gary

ASE Certified Technician

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GCM master tech over 25 years

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Dave Nova

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ASE Master Certification. GM World Class Certification

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Chris (aka-Moose)

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24 years of experience diagnosing & repairing

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Mike S.

Mike S.

ASE Certified Technician

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George H.

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15+ Years ASE Master Technician with Level 1 Certification

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