Received a letter yesterday from Pontiac telling me they will replace faulty converters up to 10 years or 120,000 miles. Letter referred to 2008 G6 with 2.4 engine and 4 speed automatic. I don't know what other years are covered. Thanks GM for stepping up to the plate on this one. Haven't had the problem myself but lots have. They also say they will reimburse those who have already paid for the repair.