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# 020604057D.
Affected Component: ENGINE AND ENGINE COOLING:ENGINE
LABOR OPERATION ASSIGNMENTS FOR CONTROL MODULE PROGRAMMING. VARIOUS MODELS INCLUDING 2004 AND PRIOR PASSENGER CARS AND TRUCKS, 2003-2004 KODIAK C4500-C8500 AND TOPKICK C4500-C8500 SERIES MODELS. *TT