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# 021001.
INFORMATION REGARDING ENGINE SOON LAMP BEING ILLUMINATED FOR DIAGNOSTIC TROUBLE CODE,P0014, P1683 OR P0116 A DELAYED TRANSMISSION DOWNSHIFT AND/OR EXCESSIVE FAN NOISE. *YH