Trouble Code P0446 and reduced fuel efficiency

One of the more common engine trouble codes (aka OBD-II codes) is P0446, which indicates a problem with the EVAP system. This code recently came up, again, in our forums when user Branch1989 asked about poor fuel mileage on his Chevrolet Silverado.

Branch1989 actually had three codes thrown: P0430, P0116, and P0446. Let’s look at each of those and then go through the diagnostics that should be used to test the possible problems this truck may be having.

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