I have a 2010 Titan and the SES light came on for code P0456, small EVAP leak. I tried to self-diagnose the problem and check the evap system for signs of wear/cracking, checked the purge control valve for functionality. It all seemed good... took it in to have a smoke test done on it and no small leaks were found! The freeze frame data showed that the truck experienced environmental temperatures of -40 deg F to - 58 deg F, I live in PA so these negative temps aren't realistic. The mechanic said that it could be an ECM problem and might need to be replace. Anyone have a similar issue with the P0456 problem? Any advice is appreciated. Thanks
Small EVAP Leak - P0456
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Seeing no final outcome to this thread, I thought my outcome would help others.
Had the same P0456 on my 09, changed the gas cap with OEM, light came back on, did a vacuum test on the evap purge valve and found that it would loose pressure slowly, replaced the valve.
Its located on the drivers side of the engine, need to remove the engine cover to get at it.
Had the same P0456 on my 09, changed the gas cap with OEM, light came back on, did a vacuum test on the evap purge valve and found that it would loose pressure slowly, replaced the valve.
Its located on the drivers side of the engine, need to remove the engine cover to get at it.
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Thanks for providing your solution! It's awesome when folks do that.
Since I have the engine cover off of mine, here's a pic of the purge valve on my '07 Armada
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I'd check the hoses at the PCV valves also. (As well as the PCV's themselves)
I replaced my PCV's recently (only $10 each) and noticed that the hoses aren't all that snug on the PCV nipple anymore. I need to replace those 2 hoses but haven't done so yet. I just moved the clamps up a hair so they got a better bite.
I replaced my PCV's recently (only $10 each) and noticed that the hoses aren't all that snug on the PCV nipple anymore. I need to replace those 2 hoses but haven't done so yet. I just moved the clamps up a hair so they got a better bite.
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Years ago I was getting this code on my '07. The mechanic removed the evap canister and blew out the solenoid with compressed air and applied voltage to operate it repeatedly. Reinstalled it and the problem disappeared. He did caution me to stop topping-off the gas tank when I filled-up. I took his advice and the problem never returned.
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That's good info. I need to stop doing that as well.
Nissan Technical Service Bulletin: NTB17-082a
Thank you, I had found that NTB and had to special order the Oring, replaced it but it didn't solve the issue.
I finally solved it (so far) by replacing the vent valve with a $22 Chinese version from Amazon, exact copy of the $130 OEM.
I'll report back after more miles.
Old thread revival!!
my 2013 P4X threw this code while at the Pigeon Forge meet. I found this thread while researching, and purchased a replacement valve for $15, comes with the O-ring. Worth a shot.
On another note, I filled the tank to the top, and kept filling until it hit the top of the fill, since I was going for some mountain drives , wanted enough gas…next morning, boom, SES light.
So what’s this business about not filling it all the way up?
my 2013 P4X threw this code while at the Pigeon Forge meet. I found this thread while researching, and purchased a replacement valve for $15, comes with the O-ring. Worth a shot.
On another note, I filled the tank to the top, and kept filling until it hit the top of the fill, since I was going for some mountain drives , wanted enough gas…next morning, boom, SES light.
So what’s this business about not filling it all the way up?
Update on my issue, vent valve solved it.
JBA long tube headers, PRT B-pipes w/hi-flow cats, JBA 30-1403 3 cat back, Borla XR-1 muffler
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Recently had the P0456 (small evap leak) as well. I replaced the vent control valve/solenoid and it fixed the issue. The old one was a rusted, crusty mess. Probably seized-up internally. Located under the truck, rear, driver's side. Guessing that's the vapor cannister it plugs into. I used part# 14935-JF01C. The part number varies for different models and it's been updated a few times.
Based on reading, I also purchased the one for underneath as well…so when I get a chance, I will replace both the one under the hood and the one underneath!
Old thread revival part deux!
finally replaced my purge valve by the vapor canister, as my SES light decided to stay on permanently…we shall see if it cures it….I want to replace the o e under the hood as well, but can’t find the part number….anyone got it?
finally replaced my purge valve by the vapor canister, as my SES light decided to stay on permanently…we shall see if it cures it….I want to replace the o e under the hood as well, but can’t find the part number….anyone got it?
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