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Pete Comeau

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  1. Pete Comeau
    2018 Denali with 8 speed trans. having same issues. Only with cold start for about 1 minute driving. Dealer has reprogrammed transmission, replaced driveshaft and reprogram, tranny flush and reprogram again to no avail. Seems to be at its worse with light throttle but afraid it will do damage with more acceleration as the jerkiness is worrisome. 65k kilometers and now pulling 6700lb travel trailer leaves me to think troubles ahead if this issue isn’t solved. Booked once again to check rear axle and hopefully have that flushed. If no success then it’s bye bye GM for life.
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