Exhaust Noise

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Condition	Action
WARNING: 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 Exhaust Muffler Replacement (LV1) , or Exhaust Muffler Replacement (L96, LC8) .
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 (LWN) , or Catalytic Converter Replacement (L96, LC8) Exhaust Muffler Replacement (LV1) , or Exhaust Muffler Replacement (L96, LC8)