What is the check engine code P0442 for a 2004 Chevrolet Blazer?
P0442 on a 2004 Chevrolet Blazer indicates a problem with the evaporative emission (EVAP) system small leak. This system prevents fuel vapors from escaping into the atmosphere. The code means the system has detected a small leak somewhere in the lines, hoses, or components of the EVAP system. This could be a loose gas cap, a cracked hose, a faulty purge valve, or other related component.