Exhaust Noise

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Condition	Action
CAUTION: While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system. DEFINITION: An audible or physical noise due to a faulty component or damaged components causing a loose or misaligned exhaust system resulting in a rattle or vibration noise (buzz, groan, hum).Refer to Symptoms - Engine Exhaust prior to beginning this table.
Popping or hissing noise	Exhaust leak. Refer to Exhaust Leakage .
Loud exhaust	Compare to a known good vehicle. Inspect for a damaged or failed muffler or resonator. Replace the faulty muffler. Refer to Muffler Replacement (1500 Series w/4.3L, 4.8L, 5.3L, 6.0L) or Muffler Replacement (1500 Series w/6.2L) or Muffler Replacement (2500/3500 Series w/6.0L) or Muffler Replacement (2500/3500 - Cab/Chassis w/6.0L) or Muffler Replacement (6.6L) .
External rattle or vibration noise	Inspect for a bent or loose hanger, loose heat shield, or loose clamp. Inspect for a exhaust pipe causing interference. Repair or replace the affected component. Refer to the affected component's service procedure.
Internal rattle	Test the components by tapping with a rubber mallet to confirm a rattle. Replace the faulty catalytic converter, or muffler. Refer to one of the following procedures: Catalytic Converter Replacement (4.3L) Catalytic Converter Replacement (4.8L, 5.3L, 6.0L, 6.2L) Catalytic Converter Replacement (6.6L) Muffler Replacement (1500 Series w/4.3L, 4.8L, 5.3L, 6.0L) Muffler Replacement (1500 Series w/6.2L) Muffler Replacement (2500/3500 Series w/6.0L) Muffler Replacement (2500/3500 - Cab/Chassis w/6.0L) Muffler Replacement (6.6L)