"Some of them may have been built with improper side-impact sensor wire routing in the left front door," wrote GM spokesman Alan Adler in response to a query on Thursday.
GM is aware of one crash with one injury that may be related to the improper wiring.
The new recall is not linked to the 2014 GM recall of 2.6 million vehicles, including the 2005-'10 Cobalt, for an ignition-switch defect that could cause the airbags to be disabled, Adler wrote.
Chevrolet dealers will inspect all affected vehicles and any found with the condition will be repaired. A date has not been set for the recall. Owners can contact Chevrolet customer service at 1-800-222-1020.
No information about the recall has been posted on the Web site of the National Highway Traffic Safety Administration, which oversees vehicle safety in the U.S.
Edmunds says: Owners of these cars can wait for their official recall notice and then schedule a service appointment at their dealerships or check in with their dealer now for next steps.