Lock outs as other members mention, definitely exist. Typically they are solenoids that prevent access to first gear until certain conditions are met. Same technology in a more nefarious application is the dreaded GM Skip Shift feature. It wouldn’t allow you to access 2nd and 3rd gears unless you got on the throttle pretty hard and are above a certain speed. I know this is STILL a feature on Corvettes. Guess the DCT in the C8 solves that problem though...
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