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# SB-09-08-42-006.
GMC/CHEVROLET: TRAILER AND VEHICLE BRAKE LIGHTS DO NOT ILLUMINATE WHEN INTEGRATED TRAILER BRAKE CONTROL SYSTEM (ITBC) MANUAL TRAILER BRAKE APPLY LEVER IS USED (REPROGRAM BODY CONTROL MODULE (BCM). *PE