One problem related to wiring has been reported for the 2009 Chevrolet Cobalt. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Chevrolet Cobalt based on all problems reported for the 2009 Cobalt.
Wiring harness in driver's side front door creates an electrical short that disables side impact sensors/airbags. Symptoms match exactly the an existing recall (15v500000) that lists only the 2010 model year as being affected. The disabling of the airbag happens every time the driver's side window is rolled down. This occurs when driving and stationary.