An exhaust rattle may be heard underneath the vehicle on some 2018-2024 Camaro models with the 3.6L engine (RPO LGX). The rattle may be most noticeable when starting the engine or apply the throttle.
If the rattle sound is heard, it may be caused by the exhaust resonator (Fig. 17), not the exhaust valves.
Fig. 17
Inspect the lower weld of the structural tube (Fig. 18) on the bottom of the exhaust resonator and the upper weld on the top of the resonator for any signs of cracking.
Fig. 18
The tube in the center of the resonator is a structural component that stiffens the upper and lower halves of the assembly. It is not a drain tube for condensation inside the exhaust system and corrosion alone will not cause the rattle condition.
If the welds holding the structural tube in place are cracked, replace the rear portion of the exhaust system. (Fig. 19) Refer to Exhaust Muffler Replacement in the appropriate Service Information.
Fig. 19
For more information, including part numbers, refer to Bulletin #23-NA-216
– Thanks to Kurtis Hoezee
