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Chevy Silverado 1500 Trouble Code PO442 Gas Cap Replaced

2003 Silverado 1500 Trouble code PO442. I replaced the gas cap, but the EVAP monitor won't complete.

I got a new gas cap and my code reader give's me a incomplete on evap system. this trouble code PO442 has not returned however.


The EVAP monitor might take some time to run and set. Insure your gas tank is always (and only) 1/4 to 3/4 full until the monitor runs. It could take up to 300-400 miles, and 1 to 2 weeks of driving until it shows ready. We recommend driving in a variety traffic conditions; freeway, city, stop-and-go. Avoid sharp turns and hills.

posted by SmogTips Support 01-02-2012 09:27 AM