Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Chevrolet for this TSB. Call your local Chevrolet dealer's service department & ask for a copy of TSB# PI0562E.
THIS PRELIMINARY INFORMATIONAL BULLETIN PROVIDES A PROCEDURE TO REPROGRAM THE ECM FOR CONCERNS REGARDING A LOUD RATTLE NOISE ON START UP THAT STOPS IN 3 SECONDS OR LESS.