I have a 2010 LT auto only 20,000 miles. I notice an occasional light rattling noise that appears while moving at low speeds, and only at low rpm mostly happens right after letting off the gas and coasting, or less occasionally while applying a very, very light but constant steady gas, like at a real slow gradual acceleration. The rattling never comes at higher speed or during faster acceleration unless it's just that the engine is too loud to hear the rattle during faster acceleration. I have not yet been able to identify the location of rattle but I'm guessing maybe the exhaust.

Just wondering if anyone else has had such rattle or if it is a common thing that is easily correctable?

 

Just wanted to add that I can't get the rattle to appear while car is not in motion like a stop light or just idling