I suggest you call the GM consumer hotline at 800-222-1020 and keep pressing 0 until you get to speak to a person concerning this issue. You also may want to call the National Highway and Traffic Safety Administration at 888-327-4236. I take this problem very seriously, and you should, too.
Larry Rubenstein is a master technician who owns a North Shore service station. His column appears every Saturday. Write to Larry at The Salem News, c/o Auto Scanner, 32 Dunham Road, Beverly, MA 01915, or send an email to firstname.lastname@example.org.