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11-06-2012, 11:12 PM
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Hummer Authority
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Join Date: Dec 2003
Location: New Braunfels/Canyon Lake, TX
Posts: 1,357
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"Service 4WD" plus burning smell?
New problem - my "Service 4WD" keeps coming up. I've been able to clear it in the past by changing into high/low gear for a moment, but this time it keeps coming back on - but only after I've run the truck for a while, never on start up. Once I shut the truck off after running it, I've been noticing a burning smell from the front end, like meltiing plastic. Ideas?
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2003 yellow Lux, 12" Bulletproof lift, 42" Pitbull Rockers, 20" Ultra Predators, Corsa sport exhaust, painted interior
2004 Cadillac Escalade, white diamond, dual tip chrome exhaust, 20" chrome 9-spoke rims, altezzas - TOTALLED!!!! Replaced with a nondescript 2009 Chevy Tahoe
1970 VW Karmann Ghia, black with a flame job and too many mods to list
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11-07-2012, 01:37 AM
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![[__--MUD--__]'s Avatar](image.php?u=8286&dateline=1300594796) |
Hummer Expert
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Join Date: Dec 2007
Posts: 705
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Re: "Service 4WD" plus burning smell?
Didn't you put headers on this summer? If so, i'd look to see if anything is touching them now.
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11-07-2012, 07:00 PM
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Hummer Authority
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Join Date: Dec 2003
Location: New Braunfels/Canyon Lake, TX
Posts: 1,357
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Re: "Service 4WD" plus burning smell?
Nope, headers are in the clear. I did see one of the wires to the headlights touching the engine though and resecured that. But on the way home today, it was more of a brake-pad smell and super strong. There was supposedly an industrial fire in that area tho, I hope that was all it was and nothing new!
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2003 yellow Lux, 12" Bulletproof lift, 42" Pitbull Rockers, 20" Ultra Predators, Corsa sport exhaust, painted interior
2004 Cadillac Escalade, white diamond, dual tip chrome exhaust, 20" chrome 9-spoke rims, altezzas - TOTALLED!!!! Replaced with a nondescript 2009 Chevy Tahoe
1970 VW Karmann Ghia, black with a flame job and too many mods to list
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11-07-2012, 09:32 PM
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Hummer Veteran
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Join Date: Sep 2012
Posts: 61
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Re: "Service 4WD" plus burning smell?
I also have the "service 4WD" alarm after driving awhile. I received a hint that it may be due to low battery voltage, so I am going to do a full charge tonight. I will report later.
I have no ideas about the smell.
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11-07-2012, 10:42 PM
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Hummer Authority
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Join Date: Jan 2008
Location: Gaithersburg, MD
Posts: 1,763
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Re: "Service 4WD" plus burning smell?
The one and only time I got the Service 4WD it ended up being a faulty transfer case shift control switch (15127829).
15 in the diagram: http://parts.nalleygmc.com/showAssem...modelYear=2005
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11-07-2012, 11:36 PM
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Hummer Authority
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Join Date: Dec 2003
Location: New Braunfels/Canyon Lake, TX
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Re: "Service 4WD" plus burning smell?
Smell is gone now, that's a good thing.
Been watching for my error message - it's very intermittent, and when the "Service 4WD" comes on, the locker button (top round button) starts flashing. Then the message goes off and the light stops. This will do this maybe every 10-15 mins when I'm driving, and lasts for maybe a minute.
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2003 yellow Lux, 12" Bulletproof lift, 42" Pitbull Rockers, 20" Ultra Predators, Corsa sport exhaust, painted interior
2004 Cadillac Escalade, white diamond, dual tip chrome exhaust, 20" chrome 9-spoke rims, altezzas - TOTALLED!!!! Replaced with a nondescript 2009 Chevy Tahoe
1970 VW Karmann Ghia, black with a flame job and too many mods to list
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11-07-2012, 11:40 PM
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Hummer Expert
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Join Date: Mar 2009
Location: Burnsville, MN
Posts: 657
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Re: "Service 4WD" plus burning smell?
check the fluids in the T case?
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2003 Black Hummer H2 Adventure Package
4.88 gears *** Cognito UCA & SwayBar Links *** Kryptonite tie rods *** K&N CAI *** 37x12.50xR20 BFG KM2 Mud Terrain's *** 20x10 Black KMC Rockstars *** EBC Slotted Rotors *** N-FAB Sidesteps *** Line-X Grill *** Recon Smoke Cab Lights ***Diablo Predator U7193
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11-08-2012, 03:07 PM
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Hummer Authority
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Join Date: Jun 2005
Location: Key Largo
Posts: 1,174
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Re: "Service 4WD" plus burning smell?
Quote:
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Originally Posted by guruerror
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+1
Had the exact same issue when the H2 was new. It would come on randomly and then go off, but it started staying on and Lynch replaced the switch in 2007 and not a single SERVICE4WD since then. Problem solved. |
11-10-2012, 10:55 PM
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Hummer Professional
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Join Date: Sep 2008
Location: Utah
Posts: 293
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Re: "Service 4WD" plus burning smell?
I've had this too. Can't remember it if was a switch or a sensor, but it was one of the two. Same thing as the other guys, when I had it replaced, the light never came on again.
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Sweet looking H2 with not enough mods (2003 Pewter H2, 20" Rockstars, 40"x15.5" Toyo MT's, E&G Extended Flares, Full body tube steel exoskeleton, 5" Skyjacker lift, Amp Research steps, Gobi Roofrack and ladders, Smoked LED's, AFe CAI, Dynatech long tubes and cats, Magnaflow exhaust, Stock tune, 4.88 gears, Chrome Grenade Shifter, interior blacked out, rear captains chairs, Solar Power!!)
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11-10-2012, 11:26 PM
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Hummer Authority
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Join Date: Dec 2003
Location: New Braunfels/Canyon Lake, TX
Posts: 1,357
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Re: "Service 4WD" plus burning smell?
Never came up all day yesterday. Odd.
Is this the $700 switch that needs to be replaced? If that's the case, I'll just deal with the blinking light.
__________________
2003 yellow Lux, 12" Bulletproof lift, 42" Pitbull Rockers, 20" Ultra Predators, Corsa sport exhaust, painted interior
2004 Cadillac Escalade, white diamond, dual tip chrome exhaust, 20" chrome 9-spoke rims, altezzas - TOTALLED!!!! Replaced with a nondescript 2009 Chevy Tahoe
1970 VW Karmann Ghia, black with a flame job and too many mods to list
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11-11-2012, 04:51 AM
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Hummer Authority
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Join Date: Jan 2008
Location: Gaithersburg, MD
Posts: 1,763
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Re: "Service 4WD" plus burning smell?
Quote:
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Originally Posted by devilsfan
Never came up all day yesterday. Odd.
Is this the $700 switch that needs to be replaced? If that's the case, I'll just deal with the blinking light.
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I think mine was about $75...I installed it myself to save the hour labor in taking the console and dash apart.
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