2009 Chevrolet Cobalt Problems
RepairPal has identified the most common problems with the 2009 Chevrolet Cobalt based on complaints from actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.
A rattle-type noise may be noted on cold start-up due to a failing timing chain tensioner. Chevrolet revised the design of the tensioner multiple times over the production of the Cobalt, replacement is necessary to remedy this condition. A failed chain tensioner may result in a broken timing chain and subsequent engine damage if the issue is not diagnosed and repaired.
A Loose or worn gas cap may cause Check Engine Light to illuminate.
The 2008-2010 Chevrolet Cobalt has known issues with the EVAP system, a part of your emission control system.
To correct the issue, the EVAP canister vent valve, solenoid, and wiring must be inspected. The most common fix is replacement of the wiring connector or replacement of the vent valve assembly.