In addition to notifying NHTSA (or Transport Canada) in a situation like this, please notify General Motors.
Call 1-800-222-1020, or write:
Chevrolet Motor Division
Chevrolet Customer Assistance Center
P.O. Box 33170
Detroit, MI 48232-5170
In Canada, call 1-800-263-3777 (English) or
1-800-263-7854 (French), or write:
General Motors of Canada Limited
Customer Communication Centre, CA1-163-005
1908 Colonel Sam Drive
Oshawa, Ontario L1H 8P7
Reporting Safety Defects to the Canadian Government
Service Publications Ordering InformationChevrolet Cobalt Service & Repair Manual. Rear Compartment Lid Hinge
Removal
1.
Raise and support rear compartment
lid.
2.
Remove compartment lid hinge bolts
(2), Fig. 1.from hinge.
3.
Remove compartment lid hinge nuts (1)
from decklid studs.
...