One problem related to emission control has been reported for the 2001 Chevrolet Silverado 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Chevrolet Silverado 1500 based on all problems reported for the 2001 Silverado 1500.
Exhaust manifold bolts malfunction allowing exhaust gases to enter cab of vehicle. This also can cause wrong readings to the emission control system ( oxygen sensor ) to richen the gas mixer to engine causing emission problems. Reason for compliant, after checking internet sites. I found out this is a to common of a problem with Chevrolet ( gm ) v8 engines. The auto repair shop I took my vehicle to, knew of this problem every well. They get several of this type of repairs monthy. They remove exhaust manifold, re-surface, remove broken bolts and reassenble using all new bolts and gasket. $350. Fyi.