2002 4x4 problem - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 01-15-2014, 10:19 PM   eBay Motors  #1 (permalink)
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2002 4x4 problem

Recently purchased an 02 duramax. the 4x4 doesn't work you push the button and it will go to 4hi and blink a few times and click in the dash but goes back to 2hi. Hearing nothing under the truck move or make any noises. So I replaced the transfer case control module out of a junk yard truck and still does it. Bought brand new transfer case with encoder motor from dhd diesel due to pump rub fail. Anyone have any ideas of what it could be. I'm lost any help is greatly appreciated
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2002 Chevy 2500hd 4x4 pewter quad cab ls short bed duramax. 140k mint. (Gmax 5 trans with 1058 converter 1-2-13) . straight piped with 5'" tip. efi live. Purchased 2-28-2012 sold to dad 4-24-13
2002 Chevy 2500hd 4x4 black crew cab Lt loaded short bed. cheeta 63mm turbo gmax trans with 1058 converter dirty hooker diesel transfer case. fresh build efi live new cp3 and injectors fass 150hd
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Old 01-16-2014, 05:22 AM   eBay Motors  #2 (permalink)
 
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Check the actuator on the front axle. Make sure wiring isn't damaged going to the actuator. Check the ground for that harness. I believe my buddy was having the same problem on his 02 and blamed it on that ground. I was having an issue on my 01 but it was the switch was going bad and wasn't the same symptoms.
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Old 01-16-2014, 06:14 AM   eBay Motors  #3 (permalink)
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Well if you replaced the module on the case itself, I would pop the connector off the module on the tcase and on the front diff. have a buddy hit the switch while you test the connectors to make sure power is getting to the connectors. If not, you need to replace your switch. If you do get power I would replace the front diff actuator. Dont quote me on that because your problem could be bad wiring, however thats not very likely.
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20. Paying for and Working on Everything Myself. Student at SWIC
2001 LB7 ECSB 2500HD 4x4 (270,000) "Isabel" Best 1/4 Mile 14.2 @ 94mph
Mods: -Big Dipper Trans/Pump Rub Fix by Todd S. -Industrial Injection 42% CP3 -Leveled (285/75R16) -Built Front End -IAH/Glow Plug Delete -4" MBRP Straight Pipe -EFI by Bobo @Twisted Diesel Tuning -Fass Tiatanium 150
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2007 LBZ CCLB DRW 3500HD 2x6 (310,000) DRW Club Member #145
Mods: -Raptor 100 Lift Pump -4" MBRP w/ muffler
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Old 01-16-2014, 06:15 AM   eBay Motors  #4 (permalink)
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I believe on both connectors each wires should be positive in 2 wheel drive and one wire will ground when you hit the 4x4 iirc
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20. Paying for and Working on Everything Myself. Student at SWIC
2001 LB7 ECSB 2500HD 4x4 (270,000) "Isabel" Best 1/4 Mile 14.2 @ 94mph
Mods: -Big Dipper Trans/Pump Rub Fix by Todd S. -Industrial Injection 42% CP3 -Leveled (285/75R16) -Built Front End -IAH/Glow Plug Delete -4" MBRP Straight Pipe -EFI by Bobo @Twisted Diesel Tuning -Fass Tiatanium 150
Wish List (always accepting donations):-Water Methanol -Twins -Heads -Rods/Pistons -Cam -Injectors -Dual Fuelers
2007 LBZ CCLB DRW 3500HD 2x6 (310,000) DRW Club Member #145
Mods: -Raptor 100 Lift Pump -4" MBRP w/ muffler
Wish List: -EFI Tunes -Rear Air Bags
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Old 01-16-2014, 09:11 AM   eBay Motors  #5 (permalink)
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Thanks guys I'll have to check it out. the encoder motors on the case is brand new came with it. I took the switch out of my fathers truck to test if it was bad and still does the same thing. I'll check the wiring and see if its ok. I don't want to have to pay the dealer to figure it out lol
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2002 Chevy 2500hd 4x4 pewter quad cab ls short bed duramax. 140k mint. (Gmax 5 trans with 1058 converter 1-2-13) . straight piped with 5'" tip. efi live. Purchased 2-28-2012 sold to dad 4-24-13
2002 Chevy 2500hd 4x4 black crew cab Lt loaded short bed. cheeta 63mm turbo gmax trans with 1058 converter dirty hooker diesel transfer case. fresh build efi live new cp3 and injectors fass 150hd
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Old 01-16-2014, 09:15 AM   eBay Motors  #6 (permalink)
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Don't forget about the t-case module under the dash, could be an issue there
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Old 01-16-2014, 11:45 AM   eBay Motors  #7 (permalink)
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I think that might be the module I replaced and mine works in my fathers truck (stole his to test) and it still won't work think I might have to take it to the stealership unfortunately.
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2002 Chevy 2500hd 4x4 pewter quad cab ls short bed duramax. 140k mint. (Gmax 5 trans with 1058 converter 1-2-13) . straight piped with 5'" tip. efi live. Purchased 2-28-2012 sold to dad 4-24-13
2002 Chevy 2500hd 4x4 black crew cab Lt loaded short bed. cheeta 63mm turbo gmax trans with 1058 converter dirty hooker diesel transfer case. fresh build efi live new cp3 and injectors fass 150hd
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Old 01-16-2014, 01:04 PM   eBay Motors  #8 (permalink)
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I'm not talking about the switch, there is a module besides the switch and the actuator on the t-case. Under/behind the dash, left side. Don't confuse it with the BCM tho
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Name: Matt
ASE Certified and GM Parts guy
MY truck - 2002 2500HD Crew Cab Short Bed

Her truck - 2006 2500HD Crew Cab Short Bed

Traded:2002 2500HD Crew Cab Long Bed
SOLD:2001 2500HD Ext. Cab Long Bed

For spicee tuna go to www.TrollPerformance.com
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Old 01-16-2014, 01:14 PM   eBay Motors  #9 (permalink)
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What I replaced had 2 connections one with 4 big wires and one with lots of wires lol have a pic of it if it would help was told that's what it was behind the switches in the dash back by the firewall
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2002 Chevy 2500hd 4x4 pewter quad cab ls short bed duramax. 140k mint. (Gmax 5 trans with 1058 converter 1-2-13) . straight piped with 5'" tip. efi live. Purchased 2-28-2012 sold to dad 4-24-13
2002 Chevy 2500hd 4x4 black crew cab Lt loaded short bed. cheeta 63mm turbo gmax trans with 1058 converter dirty hooker diesel transfer case. fresh build efi live new cp3 and injectors fass 150hd
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Old 01-22-2014, 10:14 AM   eBay Motors  #10 (permalink)
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Was told to take the fuse out and let it sit over night and put it back in no different. Then was told to clean the grounds at the frame and core support no different lol. Took it to the local gm dealer was told they can't help me because it has to many aftermarket parts and efi live can't plug it in... so does anyone have any other ideas? If the front 4wd actuator is bad will the transfer case still try to make noise? Talked to tony at all season performance (dhd) that's who gave me the advice on grounds and fueses said he'd send me another encoder motor but the new one with new transfer case .
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2002 Chevy 2500hd 4x4 pewter quad cab ls short bed duramax. 140k mint. (Gmax 5 trans with 1058 converter 1-2-13) . straight piped with 5'" tip. efi live. Purchased 2-28-2012 sold to dad 4-24-13
2002 Chevy 2500hd 4x4 black crew cab Lt loaded short bed. cheeta 63mm turbo gmax trans with 1058 converter dirty hooker diesel transfer case. fresh build efi live new cp3 and injectors fass 150hd
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