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Code P0442 on 2009 Silverado

Small leak "Gas Cap" code help
Moderator: olliepop2500

Code P0442 on 2009 Silverado

Postby tmurph01 [OP] » Dec 10 2011, 1:15am

Been getting this code off and on for the past few months now. I know it is definitely not the gas cap. Any advice on what else to check out or any advice on the most common problem associated with this code..
2009 Silverado 1500 Z71
5.3L 6-speed auto crew cab
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tmurph01
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Firing on 6 cylinders [L1]
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Re: Code P0442 on 2009 Silverado

Postby Giovanni » Dec 11 2011, 8:40am

Here's what I got with a quick google search: http://www.obd-codes.com/p0442

A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
A small leak/hole in a fuel vapor hose/tube
Other small leak in EVAP system
Faulty vent o-ring seal

the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, or
Inspect the EVAP system for cuts/holes in tubes/hoses
Giovanni
Firing on 8 cylinders [L1]
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