2wd 4wd automatically switching while driving stuck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CJ5 Convert · 01-01-2009, 09:33 PM

So my 2006 GMC 1500 has a pushbutton electronic t-case. Sometimes I will be driving down the road and it will switch automatically into the 4wheel auto setting. It did this a day or so ago on a long road trip. Now when its in 2wd It clicks at around 55mph and up. If I put it in back in 4 auto the clicking will go away. Any help would be great. Thanks ahead of time -J

**truckdude239** · 01-02-2009, 08:12 AM

wow never heard of that one

**truckdude239** · 01-02-2009, 02:42 PM

how many miles are on it with it being an 06 might still be a warranty on it

67ChevyRedneck · 01-02-2009, 10:37 PM

If under warranty, I'd just take it in.

It may be the dash switch malfunctioning. GM has issues with the dash switches having soldered joints breaking/coming loose. They're about $50-60 off ebay or about $58 from GMpartsdirect.com. Is your "service 4wd" light coming on?

CJ5 Convert · 01-05-2009, 06:58 PM

No the light is not on. But it no longer (nuetral light on the switch) lights up when in nuetral and when I try to put it in four low it just slaps and goes back into 2hi. -J edit: also I have around 80K on 'er so no chance of warranty.

silverado84355 · 01-05-2009, 07:21 PM

On my 05 z71 it would pop into 4low but only when I would put it in reverse. It ended up being a bad "encoder motor" but mine was fixed under warranty.

msgross · 01-05-2009, 07:24 PM

I have had my 05 Tahoe in the shop 3 times for the TC... I always get "service 4WD" and then the buttons don't work. If I shut the truck off and then restart it works fine. Just did it again the other day while backing up and in AUTO...

I think chevy has major issues with this piece of crap and i'm now out of warranty... Should have kept my Ram with manual TC lever...

good luck...

TylerHuff · 01-07-2009, 10:37 PM

mine had the same problems it kept switching while i was moving and grinding in the front but it kept switching on/off on/off $180 later i had new switches and the problem went away

**bwood** · 01-08-2009, 11:04 PM

Quote:

Originally Posted by CJ5 Convert

also I have around 80K on 'er so no chance of warranty.

I thought GM started the 5yr/100k warr around this time. I remeber this because my stepdad bought a 04 and like 6 months later he saw a commercial at my house about "GM's new 5yr/100k powertrain warr" (or however they said it). It wouldn't hurt to double check. Even if it ins't, you might be able to pump the service advisor out of some info?????????

**truckdude239** · 01-09-2009, 06:56 PM

yeah calls and talk to the service department about it never hurts

67ChevyRedneck · 01-10-2009, 03:03 PM

Quote:

Originally Posted by TylerHuff

mine had the same problems it kept switching while i was moving and grinding in the front but it kept switching on/off on/off $180 later i had new switches and the problem went away

What switches were replaced?

GM started the 5yr/100K mile warranty in 2007 and it only applied to all 2007+ trucks and the 2007 "classic" Silverado.

http://www.autoblog.com/2006/09/06/g...100-000-miles/

CJ5 Convert · 01-13-2009, 09:22 PM

Yeah apparantly it's not covered by warranty and the good news is they say the T-Case is shot. I'm not sure what it cost to rebuild one but the stupid chevy house said it was 1700 in parts and wasn't worth rebuilding. I should just buy a new one. Common guys who has thrashed a t-case in one of these trucks I need some prices. So I know if I'm getting raped or not. Thanks -J

Also yes I will get a second opinion this week.

**truckdude239** · 01-13-2009, 10:46 PM

sounds right but i'd go to a junk yard and find one to shove in it

**bwood** · 01-13-2009, 11:34 PM

Did they actually look at it or just guess at it? Talk to a transmission shop, this is something they should handle. I may be wrong, but I believe he is talking about the switches in the dash to actually change it into 4wd. If is like some of the newer GM circuit boards (like the AC control heads), It might just be shot. You could also buy the transfer case from someone like Scoggins Dickey ( www.sdparts.com. New GM T-Cases come with a 2ry/24k warr (parts and labor).

Here is a backstory on the circuit board comment:

My wife drives a 99 Malibu, the AC control head has failed 6 times. Twice under warr.
My wife's right side taillight circuit board has failed once.
My 98 GMC AC control head has failed 3 times, twice under warr.
My 98 GMC taillight circuit boards have failed (very, very common)
My stepmoms's 99 Tahoe AC control head has failed 4 times, once under warr
Also her tailight circuit boards have failed.

All of these are built the same with very cheesy construction.

TylerHuff · 01-14-2009, 10:28 PM

Quote:

Originally Posted by 67ChevyRedneck

What switches were replaced?

GM started the 5yr/100K mile warranty in 2007 and it only applied to all 2007+ trucks and the 2007 "classic" Silverado.

http://www.autoblog.com/2006/09/06/g...100-000-miles/

sorry i just noticed this the switch on the dash that just plugs in that has auto 4wd, 2hi and all that just the push buttons. that is what was malfunctioning causing my t case to switch

67ChevyRedneck · 01-15-2009, 03:24 AM

^Thanks, I'm 99% sure that's whats wrong with my truck. It still functions when I need it to (it's not switching the transfer case on its own, if it was, I would swap it immediately, mine just doesn't shift sometimes when I want it to, when it does that, I shut it off and restart it and it works), so I'm holding out a little longer, I just spent a bunch of $ on my 67 and 4wd isn't a necessity in SC

***Josh*** · 01-15-2009, 10:15 PM

Probably the encoder sensor that tells it what gear it is in. However if its been poppin in and out of 4wd cause of it the case is probably trashed. If your rebuilding one with GM parts you can buy a reman far cheaper and a junkyard unit even cheaper than that. I've had a few failed transfer cases do like yours but usually they just slip or fall into neutral and don't wanna move...

67chevyredneck, your problem is the dash switch which is very common for the year of your truck. The later models had the encoder sensor issues.

Josh

01-01-2009, 09:33 PM	#1
CJ5 Convert Registered User Join Date: May 2007 Location: Las Cruces, NM Posts: 1,079	2wd 4wd automatically switching while driving stuck So my 2006 GMC 1500 has a pushbutton electronic t-case. Sometimes I will be driving down the road and it will switch automatically into the 4wheel auto setting. It did this a day or so ago on a long road trip. Now when its in 2wd It clicks at around 55mph and up. If I put it in back in 4 auto the clicking will go away. Any help would be great. Thanks ahead of time -J __________________ - Jason *Orange Crush - 1969 K5 Blazer CST 4WD MONEY PIT* 1975 CJ5 Renegade - Levi's Edition - 304 V8 original paint Last edited by CJ5 Convert; 01-01-2009 at 09:49 PM. Reason: I miss typed

01-02-2009, 08:12 AM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: 2wd 4wd automatically switching while driving stuck wow never heard of that one __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

01-02-2009, 02:42 PM	#3
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: 2wd 4wd automatically switching while driving stuck how many miles are on it with it being an 06 might still be a warranty on it __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

01-02-2009, 10:37 PM	#4
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: 2wd 4wd automatically switching while driving stuck If under warranty, I'd just take it in. It may be the dash switch malfunctioning. GM has issues with the dash switches having soldered joints breaking/coming loose. They're about $50-60 off ebay or about $58 from GMpartsdirect.com. Is your "service 4wd" light coming on? __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 01-02-2009 at 10:39 PM.

01-05-2009, 06:58 PM	#5
CJ5 Convert Registered User Join Date: May 2007 Location: Las Cruces, NM Posts: 1,079	Re: 2wd 4wd automatically switching while driving stuck No the light is not on. But it no longer (nuetral light on the switch) lights up when in nuetral and when I try to put it in four low it just slaps and goes back into 2hi. -J edit: also I have around 80K on 'er so no chance of warranty. __________________ - Jason *Orange Crush - 1969 K5 Blazer CST 4WD MONEY PIT* 1975 CJ5 Renegade - Levi's Edition - 304 V8 original paint Last edited by CJ5 Convert; 01-05-2009 at 06:59 PM.

01-05-2009, 07:21 PM	#6
silverado84355 Registered User Join Date: May 2007 Location: Carlsbad,NM Posts: 99	Re: 2wd 4wd automatically switching while driving stuck On my 05 z71 it would pop into 4low but only when I would put it in reverse. It ended up being a bad "encoder motor" but mine was fixed under warranty.

01-05-2009, 07:24 PM	#7
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: 2wd 4wd automatically switching while driving stuck I have had my 05 Tahoe in the shop 3 times for the TC... I always get "service 4WD" and then the buttons don't work. If I shut the truck off and then restart it works fine. Just did it again the other day while backing up and in AUTO... I think chevy has major issues with this piece of crap and i'm now out of warranty... Should have kept my Ram with manual TC lever... good luck... __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer" Last edited by msgross; 01-05-2009 at 07:24 PM.

01-07-2009, 10:37 PM	#8
TylerHuff Registered User Join Date: Sep 2008 Location: Blue Springs, MO Posts: 168	Re: 2wd 4wd automatically switching while driving stuck mine had the same problems it kept switching while i was moving and grinding in the front but it kept switching on/off on/off $180 later i had new switches and the problem went away __________________ 1987 Gmc sierra 1962 Apache 10

01-09-2009, 06:56 PM	#10
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: 2wd 4wd automatically switching while driving stuck yeah calls and talk to the service department about it never hurts __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube Last edited by truckdude239; 01-09-2009 at 06:56 PM.

01-13-2009, 09:22 PM	#12
CJ5 Convert Registered User Join Date: May 2007 Location: Las Cruces, NM Posts: 1,079	Re: 2wd 4wd automatically switching while driving stuck Yeah apparantly it's not covered by warranty and the good news is they say the T-Case is shot. I'm not sure what it cost to rebuild one but the stupid chevy house said it was 1700 in parts and wasn't worth rebuilding. I should just buy a new one. Common guys who has thrashed a t-case in one of these trucks I need some prices. So I know if I'm getting raped or not. Thanks -J Also yes I will get a second opinion this week. __________________ - Jason *Orange Crush - 1969 K5 Blazer CST 4WD MONEY PIT* 1975 CJ5 Renegade - Levi's Edition - 304 V8 original paint

01-13-2009, 10:46 PM	#13
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: 2wd 4wd automatically switching while driving stuck sounds right but i'd go to a junk yard and find one to shove in it __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube Last edited by truckdude239; 01-13-2009 at 10:46 PM.

01-13-2009, 11:34 PM	#14
bwood Registered User Join Date: Jan 2003 Location: Denison, Texas Posts: 1,919	Re: 2wd 4wd automatically switching while driving stuck Did they actually look at it or just guess at it? Talk to a transmission shop, this is something they should handle. I may be wrong, but I believe he is talking about the switches in the dash to actually change it into 4wd. If is like some of the newer GM circuit boards (like the AC control heads), It might just be shot. You could also buy the transfer case from someone like Scoggins Dickey ( www.sdparts.com. New GM T-Cases come with a 2ry/24k warr (parts and labor). Here is a backstory on the circuit board comment: My wife drives a 99 Malibu, the AC control head has failed 6 times. Twice under warr. My wife's right side taillight circuit board has failed once. My 98 GMC AC control head has failed 3 times, twice under warr. My 98 GMC taillight circuit boards have failed (very, very common) My stepmoms's 99 Tahoe AC control head has failed 4 times, once under warr Also her tailight circuit boards have failed. All of these are built the same with very cheesy construction. __________________ 1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec -Gibson Stainless Cat Back Swept Side -SS Wheels 2005 Honda CRF250R 2006 Honda CRF150F Last edited by bwood; 01-13-2009 at 11:35 PM.

01-15-2009, 03:24 AM	#16
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: 2wd 4wd automatically switching while driving stuck ^Thanks, I'm 99% sure that's whats wrong with my truck. It still functions when I need it to (it's not switching the transfer case on its own, if it was, I would swap it immediately, mine just doesn't shift sometimes when I want it to, when it does that, I shut it off and restart it and it works), so I'm holding out a little longer, I just spent a bunch of $ on my 67 and 4wd isn't a necessity in SC __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 01-15-2009 at 03:26 AM.

01-15-2009, 10:15 PM	#17
*Josh* He's got mean nasty FANGS! Join Date: Dec 1999 Location: Rockwell, NC Posts: 6,508	Re: 2wd 4wd automatically switching while driving stuck Probably the encoder sensor that tells it what gear it is in. However if its been poppin in and out of 4wd cause of it the case is probably trashed. If your rebuilding one with GM parts you can buy a reman far cheaper and a junkyard unit even cheaper than that. I've had a few failed transfer cases do like yours but usually they just slip or fall into neutral and don't wanna move... 67chevyredneck, your problem is the dash switch which is very common for the year of your truck. The later models had the encoder sensor issues. Josh __________________ 2004 K2500 Burb 1999 C3500 1985 Cutlass Supreme 1969 C-10 1967 C-10 Panel josh@67-72chevytrucks.com



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