Gas Recirculation Valve (egr Valve) problems of the 2017 GMC Sierra

Noticed vivid and persistent engine vibration shortly after purchase - with no associated check engine code. Vibration happens at all engine and ambient temperatures (especially below 50 degrees fahrenheit), at all altitudes, regardless if in park, neutral, or drive. Vibration is so noticeable, you can watch the waves vibrate through a class of water when placed on the dashboard. Taken to two different dealerships and both have stated the vibration experienced is per normal design for 6. 2l engine. Hard to believe gm would design a $65k+ vehicle that purposely vibrates/shakes. Escalated through gm corporate (sr# 8-3108393xxx), to which they confirmed truck is running as designed. Since the engine was not throwing a code, no further investment/resolution was needed on their end. Their solution to me. . . Sell the truck if not happy. Of course they did not say that, but that's the way I interpreted their response to mean. Buyer beware.