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Old 06-06-2006, 12:44 PM   #1
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Chevy 2500 HD question?

I have a 2003 2500 HD 4 wheel drive with 28000 miles. Today we took our trailer to a repair shop about 60 miles. On our way back home service 4 wheel drive came up and the lights to the 4 wheel drive went out so we stopped and read the manual not much was stated. So when we got home we called the dealership thinking the worse, but the guy told us to bring it in Wednesday and it would be free to fix still under warrenty. We never have used the 4 wheel drive it just came with the truck (Ha) Has anybody had this happen? I love my truck and have had no problems till now.
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Old 06-06-2006, 12:53 PM   #2
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Becky , it's a very common problem , it's actually not the 4wd but a switch under the dash , usually. Mine does the same thing , if you have the steering wheel controls , try hitting one of the fuctions . When I do this on mine it goes off and doesn't show up again for months . If you're still under warranty take it in and they'll fix it. Good luck
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Old 06-06-2006, 01:27 PM   #3
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Yeah, had the same issue w/my truck. Dealer replaced a switch-no $. They were familiar with the problem...
I would try to get it out of 4wd for now (not good to drive on dry pavement). You may try backing up 20-30 yards and then putting tranny in neutral before hitting the 2wd button.
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Old 06-06-2006, 01:33 PM   #4
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hasn't happened to my 04 yet

Love my DMAX!!!
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Old 06-06-2006, 01:49 PM   #5
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No Such Problem With My 2005... Yet!

How are you folks doing on fuel consumption?
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Old 06-06-2006, 02:00 PM   #6
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Thanks folks I new all I had to do was ask and I would get some help here. We did drive about 40 miles hope it didn't hurt anything.
As far as gas mileage I haven't checked. We only are camping close around to our house at this time we do plan a vacation toward the end of July I'll check it for sure then. Gas will probably be $5 a gallon then.
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Old 06-06-2006, 03:47 PM   #7
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Quote:
Originally Posted by klevan
How are you folks doing on fuel consumption?
Averaging about 14 hand calculated in the White and Green Mts towing my rig. Two years ago got 16 going up to Nova Scotia and back (2600 mi )
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Old 06-06-2006, 05:18 PM   #8
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towing MPG decreases per increase in MPH

I noticed on our last outing that I was in the high 14s when I kept CC around 63 MPH. When I bumped it to 65 MPH I dipped down to the 12/13 MPG range. I'm in the 18s or higher when not towing.
-KL
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Old 06-06-2006, 05:20 PM   #9
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Quote:
Originally Posted by silverback
I noticed on our last outing that I was in the high 14s when I kept CC around 63 MPH. When I bumped it to 65 MPH I dipped down to the 12/13 MPG range. I'm in the 18s or higher when not towing.
-KL
Are you a 4X4 ?
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Old 06-06-2006, 05:25 PM   #10
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Quote:
Originally Posted by klevan
Are you a 4X4 ?
Yes. Duramax/Allison with 4X4 (Banks Monster exhaust, Hypertech L1, Uni filter, 265X75/16 Wrangler Silent Armour, Snug Top XV etc...).
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Old 06-06-2006, 05:29 PM   #11
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Quote:
Originally Posted by silverback
Yes. Duramax/Allison with 4X4 (Banks Monster exhaust, Hypertech L1, Uni filter, 265X75/16 Wrangler Silent Armour, Snug Top XV etc...).
My towing mileage is almost exactly the same as yours, but I can't do much better without the trailer. Do you suppose it's the Snug Top, the Banks Exhaust, or a combination of the two?
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Old 06-06-2006, 07:31 PM   #12
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mine did the same thing, bad circuit board on the back of the switch.

much to my suprize the switch/board is manufactured by lucas...the prince of darkness!

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Old 06-06-2006, 08:41 PM   #13
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Quote:
Originally Posted by klevan
My towing mileage is almost exactly the same as yours, but I can't do much better without the trailer. Do you suppose it's the Snug Top, the Banks Exhaust, or a combination of the two?
Klevan,
The Banks exhaust really only helps keep the exhaust gas temps (EGT) lower. I think the Snugtop helps along with keeping my tire pressure (obsessively) adjusted. Mostly I think it is not putting my foot into all that torque just for fun. I'm driving the speed limit or lower these days.
-Ken
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Old 06-06-2006, 09:30 PM   #14
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Duramax-Allison for me. Without the trailer and on 2 lane highway only I can get almost 19mpg including time going thru small towns -- never exceeding 59mph.

I'm still on tow break-in (not to exceed 50mph) for another 300 miles . We pulled the Safari about 55 miles north two weeks ago over the flattest of flat river plain -- 50 mph, 16.8mpg. I'll always be keeping this rig at or below the trailer tire 65mph limit.

I'm going to prove it out on a long trip to Illinois for the Midwest Rally this weekend. I'll post back here afterward.
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