The muffler heat shield may become loose on the muffler causing a rattle or popping noise. Our technicians tell us there is a kit available from GM to correct this problem.
Average mileage: 105,818 (50,000–165,000)
20 people reported this problem
when start driving in a very low speed then sounds was generated underneath the vehicle. seems like the exhaust piping area. can't even duplicated even you try to bring up the truck and tried to duplicate the sound but nothing will found. looking forward to have information on this on hoiw to resolved.