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.
Car Problem Reports
Pontiac Grand Prix GTP Serpentine Belt Tensioner Pulley May Wear Out
Pontiac Grand Prix GTP Problem
Engine Affected: 3.8L V6
Average Mileage: 91,000 mi (75,000 mi - 113,000 mi)