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Old 03-05-2013, 09:04 PM
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Re: Engine Code- P0456

It looks like this is a popular code, P0456. I just had my light turn on and did a quick check I will get a gas cap first to see if this fixes the issue if not I will start looking at the hoses.

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Old 11-13-2016, 05:00 AM
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Re: Engine Code- P0456

Good morning all.
I just wanted to add my experience with my daughters ,'14 GC w/ MIL PO456 'very small evap leak'
Truck is new to her 2 bought months ago .
Nice truck.
MIL came on and went through the usual checks gas cap lines etc.,etc.
Has no cap ,but looks to seal ok.
Getting set op tp do a smoke test ,I noticed the plug in the service port for smoke test under hood was ( very) loose in the socket.(not sealing?)
can get a pic if anyone needs it. Just have to wait until she comes around!
Smoke test showed nothing. I cleared the code again ,put a dab of silicone on the plug locked it in and now it has been a week with no light. Came on the next day after I cleared it the last time
Pretty sure I stumbled on to this out of luck , but hope it helps someone else.
By the way I am a Certified ASE Master tech .
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