Code P0442, CAN BUS Off and large Evap leak?

2009 CHEVROLET MALIBU
106,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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JILL OWENS2
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My car started throwing the code P-0442 and when scanned it came back Large EVAP Leak also with the error CAN BUS-A Off no communication. I replaced my purge valve and that’s working fine. Where should I start to look next? Also, I’m lost with the CAN BUS, any ideas on where to look there as well? Any suggestions on this matter are welcomed!
Thank you
-JO
May 5, 2025 at 10:47 AM
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MECHTRIX
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Also the number on reason evap problem is a loose or bad gas cap check it to see if it leaks look at the rubber seal if its crack missing dried out leaky or if the cap doesn't tighten properly replace it. Check all evap tanks and hoses at the gas tank and engine compartment for loose leaking cracks or disconnected listen for a hissing sound especially down by the fuel tank check all hoses there. Check all evap devices plugs wires connectors pressure control valve
You said you changed the purge valve that might have solved the problem already after going over the rest of the checks. I'd erase the codes and drive it and see if any codes come back, they might not.
May 5, 2025 at 9:51 PM
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JILL OWENS2
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No I thought the purge valve would solve it, but it hasn’t. I will continue to look for the leak, but I was hoping for an idea for a certain spot then me guessing! But thank you for your advice.
May 5, 2025 at 9:55 PM
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STRAILER
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Yep, here is a video to help you find the leak.

https://www.youtube.com/watch?v=aTNr3IEgVF0

Please upload pictures or videos in your response
Sep 5, 2025 at 3:10 PM