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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My 02 duramax will shift 1-2 fine. Get to 3000rpm in second and then limp mode kind of and down shift. Won't go past 2 at all. I have replaced input sensor, output sensor, speed sensor and both ABS sensors...


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thanks anyway

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