You referred to the timing belt cover. That is actually a timing chain cover. The G6 with any of the four engine options uses a timing chain. The mechanic meant the serpentine belt needs replacement. If it has never been replaced before, it’s easily time for that. This sounds like about 2 to 3 hours of labor and a little bit for parts. A gasket and serpentine belt shouldn’t be more than $50. Getting out for less than $500 is a small victory in itself. If you think the price is too high, get another estimate. For $360, I’d get it done, but that might just be me.
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