Question about 2002 Chevrolet Silverado 2500HD

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02 duramax w/allison trans threw a P0776 code truck would not pull forward unless in 4 wheel drive. Made clunking noise when put in drive from park. This is apparently a b solenoid but where is it located and could it cause the vehicle to not be able to climb a hill while in drive one day but be functional the next?

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Nsbu switch located driverside on the tranny where the gear selector is 2 wire plugs and 2 bolts holding it on, part is about $46 at napa, very common problem with allison

Posted on Sep 22, 2009

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this might help:
Here is the Technical Service Bulletin that maybe of help, worth looking into but can't guarantee that it would fix your problem Steering - Steering Column Clunking When Turning TECHNICAL Bulletin No.: 01-02-32-001P Date: November 25, 2009 Subject: Clunk Felt/Noise Heard From Steering Column, Steering Gear and/or Front Of Vehicle During Turning Maneuver and/or Steering Wheel Rotation (Replace Intermediate Shaft As Directed) Models: 2001-2004 Buick Regal 2005-2008 Buick Allure (Canada Only), LaCrosse 2000-2008 Chevrolet Impala 2000-2007 Chevrolet Monte Carlo 1998-2002 Oldsmobile Intrigue 2004-2007 Pontiac Grand Prix Supercede: This bulletin is being revised to add the 2008 Buick LaCrosse/Allure. Please discard Corporate Bulletin Number 01-02-32-001O (Section 02 - Steering). Condition Some customers may comment on a clunk type noise coming from the front of the vehicle while driving during a turning maneuver.

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2004 silverado, duramax and allison transmission, upon cranking got note on speedometer view that cannot engage in gear. would not go in reverse.....put in drive rolled forward and then went into reverse....


What kinda batteries do you got? Are the cables any good? Sounds to me like a power/ground issuse. Either that or you have to small of batteries to crank over a high compession enigne when it's cold, with the glow plugs, and heater grid pulling all of the power from the batteries.
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Transfer case /fuse/software for transmission?


thawed it out the next morning-reset codes to standard-viola-all is well. seems ice found its way into switch@transfer case and ran the chips riot-sending tranny into limp mode. cold weather,rrrrrrrrrrrr. june can't come soon enough.
thanks anyway

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the light is on.........let's see, where you having problems with clunking noises in the front, now or before when or not in 4 wheel drive? If so sounds like cv/axle shats/joints. Last time you used 4 wheel, was there a big clunk, just once? Is there an ocasional clunk when going over bumps? If so, sounds like Ujoint. I don't belive chevys use vaccum for 4 wheel drives systems at all.

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