Exhaust System Ping/Crackle/Snap Noise During Cool Down (Replace Exhaust System Rearward of Catalytic Convertor)

Some owners may comment on a ping/crackle/snap type noise that is audible for a short period of time after the engine is turned off. Typically, this noise is most apparent when the vehicle is being parked in a garage and may be detected from either the passenger compartment or from outside the vehicle.

This condition may be caused by the thermal related contraction/expansion of the resonator internal layers.

Replace the existing exhaust system muffler assembly, which includes the resonator, exhaust and tail pipes, with the applicable new assembly and a new catalytic converter gasket indicated below in Parts Information by vehicle model. To ensure correct installation, follow the applicable procedure contained in SI2000 as indicated in the chart below.

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: