A Loose or worn gas cap may cause Check Engine Light to illuminate.
Car problem reports
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Most reported 2008 Chevrolet Aveo5 problems
The speedometer may stop functioning with code P0722 stored in the powertrain control module (PCM). This may be caused by a worn speedometer gear due to coolant contamination of the transmission fluid. If contamination is found the radiator is most likely at fault. The transmission should also be thoroughly inspected and repaired or replaced as required.
The Chevy Aveo5 Special Value has had problems with the sensors from the day it was driven off the lot. It failed inspections for emissions every time. This time around, it was taken to the dealership for diagnosis. They said it was the electrical wiring harness. It had to be replaced. This car has had nothing but problems from day one. It's at 100,000 miles right now and has had thousands of dollars of repairs and still isn't right.