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I believe it needs to be in manual. Mine wouldn’t do it either in auto when I tried. I’m also having very funky things going on with my ecu and tcu as far as shifting fine one day and like a**cheeks the next. Not really sure if that’s the issue but we will try a diff flush and see if that does anything
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2020 Camaro LT1. Bought 10/2020 | GM PERF. CAI | GM Muffler Delete (Performance Exhaust 4” tips). | SOLD 1/2022|
2018 ZL1 Summit White | Bought 1/2022 | PDR, Recaros, Carbon Dash, WeaponX Hx System, Apex SM-10 in ZLE fitment w/PS4S
Mods after Warranty “Imma keep it stock”  |