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2008 Chevrolet Silverado 2500 HD WT 6.6L 1-2 Shift
Posted to GM Transmission on 9/30/2025 5 Replies

This Allison 1000 will miss the 1-2 shit once in the morning after sitting overnight. Sometimes it'll set p0844,p0877 and if cleared it'll run all day perfectly until it sets overnight. I've changed the internal harness and pressure switch assembly. Module...

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car Vehicle Data

2008 Chevrolet Silverado 2500 HD WT

VIN 1GCHK23618
Engine6.6 L / 8 cyl / DIESEL
Trans6-speed Automatic (Electronic)
DeliveryFuel Injection
Affected1-2 Shift
Open Help Request

car Vehicle Data

2008 Chevrolet Silverado 2500 HD WT

VIN 1GCHK23618
Engine6.6 L / 8 cyl / DIESEL
Trans6-speed Automatic (Electronic)
DeliveryFuel Injection
Affected1-2 Shift