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# PIP-4865-A.
CHEVROLET: DURING COLD TEMPERATURE, INTERNAL COMBUSTION ENGINE (ICE), RUNS WHEN VEHICLE IS PLUGGED TO CHARGER OR CYCLES ON AND OFF IF RUNNING FOR EXTENDED TIME. *PE