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I have a 2004 Hummer 6.0 4X 4. I have code P0442.

Customer Question
I have a 2004 Hummer 6.0 4X 4. I have code P0442.
Submitted: 3 years ago.Category: Chevy
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Answered in 2 minutes by:
6/30/2015
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,611
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
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Hello, my name is Bobby. Thank you for the question. Besides the light being on how does the vehicle run?
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Customer reply replied 3 years ago
No problems
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
Thank you. Most of the time this code comes up from something as simple as a bad gas cap. I would remove the gas cap and check the seal on it. If the seal is cracked or smashed then replace it. I would then clear the codes and see if it comes back. If it does come back then there is a leak in the evap system which can be a failing solenoid or broken evap line. Did you plan on fixing this yourself?
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Customer reply replied 3 years ago
Yes No Bro***** *****nes That I Can See
Which Solenoid is The Most Common To Replace or Do Them Both?
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
Have you already tried resetting the code to see if it comes back?
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Customer reply replied 3 years ago
yes it comes back after 100 miles or so
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
How did the seal on the gas cap look?
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Customer reply replied 3 years ago
Visual looks good
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
If it looks fine then I would replace the purge valve first. It is the most common of the solenoids to cause this. The only other thing you can do would be to have a smoke test done to see if there is a physical leak in the system.
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Customer reply replied 3 years ago
Location of purge valve is?
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