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In a Chevy Silverado, if you see the p0442 code pop up, it means there's probably a leak in the EVAP system. This is a pretty common issue, often caused by a loose or damaged fuel cap. Start by checking the fuel cap first. Other potential problems could include a faulty vapor canister purge valve, a leak in the fuel vapor hose, or a faulty fuel tank pressure sensor. It can be a bit of a hassle to pinpoint the exact cause, so you might want to take it to a dealership or an auto shop for a professional diagnosis.
The p0442 code on your Chevy Silverado signals a problem with the evap system, usually caused by a fuel cap not being properly tightened.
Issue with EVAP solenoid identified. Install a new solenoid located beneath the truck. To test the old one, simply use a 9-volt battery - touch the positive and negative terminals to the solenoid's connections. You should hear a clicking noise upon touching and disconnecting, and then connecting back should result in another click. If no click is heard, it indicates a defective solenoid that needs to be replaced.