I have fixed several of these P0442 codes on the Aurora and they were all leaking from the EVAP Solenoid. This is about a $20.00 part. It is located by the driver's side rear wheel on the inside of the frame. You need a 10mm socket to remove the bolt. You will have to disconnect 1 or 2 electrical connectors as well. The most difficult part is getting the EVAP line off - not too bad though.
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