The recall includes the 2006-'07 Chevrolet TrailBlazer and 2006 TrailBlazer EXT SUV; 2006-'07 GMC Envoy and 2006 Envoy XL SUV; 2006-'07 Buick Rainier SUV; 2006-'08 Saab 9-7X and 2006-'08 Isuzu Ascender SUVs.
"If the headlamp driver module is not operating correctly, the low-beam headlamps and daytime running lamps could intermittently or permanently fail to illuminate," GM said in a statement provided to Edmunds. "This condition does not affect the high-beam headlamps, marker lamps, turn signals or foglamps."
GM said it has not been able to confirm whether the defect caused any vehicle accidents.
The headlamp recall is GM's 79th recall of 2014, the automaker noted.
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.
GM has not announced a fix for the recall and has not specified a start date. Owners can contact Chevrolet at 1-800-222-1020; GMC at 1-800-462-8782; Buick at 1-800-521-7300 and Saab at 1-800-955-9007. GM dealers can make repairs to Isuzu vehicles.
Edmunds says: Owners of these vehicles will have to wait until they get their official recall notice to take action. But if you have an immediate concern, it's best to contact your dealer.