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# 111001.
Affected Component: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE
INFORMATION ON RECALIBRATING VEHICLES EXHIBITING A SERVICE ENGINE SOON LAMP ON, A DELAYED DOWNSHIFT OF THE TRANSMISSION AND/OR EXCESSIVE ENGINE FAN NOISE. *TT
