One problem related to manifold/header/muffler/tail pipe has been reported for the 2009 GMC Envoy. The most recently reported issues are listed below.
Only 8 years old and 140,000 miles the exhaust manifold has cracked allowing exhaust fumes to enter the interior of the car. I have had no accidents with this car and I see no reason why the manifold should crack. I have had cars longer then this that never had this problem. Manifolds should not just crack.
| Engine And Engine Cooling problems | |
| Manifold/header/muffler/tail Pipe problems | |
| Engine Grinding Noise problems |