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6 speed problems

autobob01

By autobob01
in Ask A GM Technician

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autobob01 Enthusiast

autobob01

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OK my dealer and tranny tech are stumped on this one. Bought new, 2009 Silverado CC w/ 6.2 and 6l80 trans. Shortlyy after I got the truck I noticed the 2-3 flare and the dealer has reprogrammed the TCM several times. Recently, 2-3 flare has gotten worse and I have noticed a 3-4 flare. Dealer rebuilt the transmission, replaced TCM, reprogrammed, still having same issues. Then they replaced transmission with a brand new unit. 2-3 flare still present but now have a 4-5 flare. Dealer is stumped and cannot figure out what is wrong. Anyone else having similar issues or have any insight?

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