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Well I know my 2010 you just hold the center button on the turning signal stick to relearn tire pressure. But on other gm vehicles I know you need to place the key in the ignition press the lock and unlock n the remote at the same time till you hear a beep and fill or release5 pounds from the driver front passenger front passenger rear and then drivers rear in that order. Then you need to put them at the right psi. Idk if it's like any of these two n the 2012. Hope these two suggestions help you
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