Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
That actually refers to an EVAP leak. That code can be caused by a small leak like a pinhole in a hose, a gas cap with a small leak. Make sure the gas cap is not loose and reset the code. If it comes back you might try another gas cap next. If the issue continues it can be very hard to find. A smoke test is usually required at that point. This is a machine that pumps smoke into the evap system to help find the leak.