The serpentine belt tensioner pulley may wear out. Our technicians tell us that in order to get a new pulley from General Motors you must purchase a complete belt tensioner assembly.
Average mileage: 153,168 (75,310–278,000)
Engines affected: 3.1L V6, 3.8L V6, 3.8L V6 Supercharged
27 people reported this problem