One problem related to engine belts and pulleys has been reported for the 2009 Chevrolet Malibu. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Chevrolet Malibu based on all problems reported for the 2009 Malibu.
Seats - front driver power seat, there is a bracket or brace that goes across the front and supports the seat, it is welded, the weld is broken, after doing forum and google searches this is a common problem for years with the broken weld, causing the seat to become unstable and allowed to rock while driving. Engine - the front engine oil seal or crankshaft pulley seal is prone to leaking, there is service bulletin out about this issue for a 6 cyl model, apparently the 4cyl model has the same problem. The fix is to have the seal replaced with an updated style constructed with a better spring and seal wiper. This can cause a substantial oil leak, even though this could not cause (to the best I know) a serious problem, it does cause oil to leak along the frame and onto the bottom of the engine and possibly onto the exhaust piping behind the engine. It also cause an environment issue causing motor oil to leak onto the ground.