Code PO456, slow EVAP leak in gas cap?

Tiny
JAYDIGGS559
  • MEMBER
  • 2012 CHRYSLER 200
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Trying to smog it but it says I have a small leak in the gas cap but I bought three gas caps for it and same thing.
Thursday, March 30th, 2023 AT 9:44 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,797 POSTS
P0456 - EVAP Leak Monitor Small Leak Detected

This fault code refers to the entire evaporative emissions system. The gas cap is just one part of that. There's the fuel tank, hoses, charcoal canister, purge valve, and a lot of other parts involved with this system. The first step is to do a quick visual inspection for things like dry-rotted hoses and rusty hose clamps, but usually small leaks can be very elusive. We use a smoke machine to inject a white, non-toxic smoke at 2 psi into the system, then we watch for where it sneaks out.

This article will explain it better than I can:

https://www.2carpros.com/articles/evap-system-code-repair
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Thursday, March 30th, 2023 AT 12:46 PM

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