I unlocked the gas gap and could tell it was under pressure. It did a "poof!" when opening. I smell no gas anywhere. Could it be a faulty gas cap? What one would you replace it with if so. Just a cheapy or better to spend a few bucks.
Just got a P0456 today...Gas cap maybe?
GoPop
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on my '13 Lounge, I had a 0456 code (small evap system leak) and CEL, as well. I removed the cap and noticed a slight scratch on the filler neck lip. I sanded the scratch off with sand paper, cleaned the lip, and applied silicon grease to the cap rubber ring. After erasing the code via a generic code reader, the code and CEL went off and has not returned since....
mine either. i cleared it on 5/26 and it still hasnt come back, but it shows as a permanent trouble code on one of my apps.
i'm just waiting for the CEL to come back on (which it has after i cleared it; i tried disconnecting the battery as well and that doesn't fully clear the trouble code), as i've developed an app that has the ability to clear codes and i'm testing a certain reply condition.
what app are y'all using to check your DTCs and does it distinguish between a permanent/persist DTC and a normal one?
i'm just waiting for the CEL to come back on (which it has after i cleared it; i tried disconnecting the battery as well and that doesn't fully clear the trouble code), as i've developed an app that has the ability to clear codes and i'm testing a certain reply condition.
what app are y'all using to check your DTCs and does it distinguish between a permanent/persist DTC and a normal one?
I am using the MultiECU Scan Windows program and ELM327 interface. But this time, I have not used it, after clearing the code with a generic OBDII reader. I know it is still stored, but for now, not having a CEL on is good enough. I'll take care of the stored DTC next time I hook up the MecuScan to my lap top.
i'm using the obdlink app with my obdlink mx+ and it shows the P0456 as a permanent dtc. i've disconnected the battery, and weeks later it came back. i cleared it, and weeks later it came back. so i looked it up online lol and the resources are saying permanent trouble codes aren't fully cleared until the problem is actually resolved.
the issue i believe is that one of the sensors is showing an error code and it simply will not be resolved until it is fixed.
not a big deal and par for the course w/automobile ownership.
if only things worked the other way lol and you could wave a wand and solve the "problem" by clearing it with a certain app
the issue i believe is that one of the sensors is showing an error code and it simply will not be resolved until it is fixed.
not a big deal and par for the course w/automobile ownership.
if only things worked the other way lol and you could wave a wand and solve the "problem" by clearing it with a certain app
This item may be defective:
Amazon.com: Dorman 310-219 Evaporative Emissions System Leak Detection Pump Compatible with Select Models : Automotive
But before you buy it, go under the rear of the car , up in the center areas and remove it from the vapor canister; clean everything, especially the rubber O ring, flip the O ring upside down, apply some oil or grease and reinstall the unit. It comes on and off by twisting it 1/4 of a turn. While there, take a good look at all the gas tank hoses and inspect for rotting or cracks. Then clear the code, fill the tank all the way up, and see if the problem reoccurs. This was the plan on mine but after dressing up the scratch on the filler neck, the code has not returned.
Amazon.com: Dorman 310-219 Evaporative Emissions System Leak Detection Pump Compatible with Select Models : Automotive
But before you buy it, go under the rear of the car , up in the center areas and remove it from the vapor canister; clean everything, especially the rubber O ring, flip the O ring upside down, apply some oil or grease and reinstall the unit. It comes on and off by twisting it 1/4 of a turn. While there, take a good look at all the gas tank hoses and inspect for rotting or cracks. Then clear the code, fill the tank all the way up, and see if the problem reoccurs. This was the plan on mine but after dressing up the scratch on the filler neck, the code has not returned.
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I've had this problem for years. Took it to the shop. They did a pressure test. It was fine. They replaced the sensor. It's still saying I have an evap leak. It goes away by itself and then comes back. Very frustrating. If you figure it out, I would love to know how you did it.
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1,817 Posts
Read post #21 about the scratch on the filler neck.
just to update the thread - i replaced the evap leak detection pump (circled in red) last tuesday. since then i 've put a bit over 30 miles on it and the P0456 is still there.
given that its a permanent trouble code (since its related to emissions), i'm thinking that it might take some more drive cycles for it to go away.
i can fill the tank all the way up as well and see if that helps (i'm at about 3/4 tank).
if the code still doesn't go away, i'll go about inspecting some of the hoses and update as to what i find.
fun times
![Image]()
given that its a permanent trouble code (since its related to emissions), i'm thinking that it might take some more drive cycles for it to go away.
i can fill the tank all the way up as well and see if that helps (i'm at about 3/4 tank).
if the code still doesn't go away, i'll go about inspecting some of the hoses and update as to what i find.
fun times
Have you clearing the code via the app or an OBDII reader? Otherwise, it may take about 50 cycles for it to away by itself. That was the way it was on other cars. On mine, 0456 code came back again, and I am in the same situation; it clears and stays off for awhile. I have not changed the evap pump yet, though.
it always stops at the first click (9 years and running). i've never overfilled it.
yup, i cleared the code and i'm able to see miles since code cleared (one of the standard PIDs that most OBD apps will show). it now shows it simply as "permanent" (no confirmed or pending until it triggers the CEL again).
love emissions stuff lol. fortunately my state doesn't test for emissions so no worries on that front. i just would like to have a car w/zero trouble codes
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48 Posts
Im afraid to even wait on the click, will be happy with 3/4 tank.it always stops at the first click (9 years and running). i've never overfilled it.
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48 Posts
Did you ever replace it? My CEL came back on with the dreaded 0456 again.
Just sayin' @dlric1
Try replacing the Vapor Canister Purge Valve with Standard Part #CP791
Over time, that part goes bad (along with the evac pump which you replaced).
Just to keep things interesting, the purge valve also "throws" the same "0456 small emission leak" CEL's
It goes under the hood, behind the engine, topside = 15 minute repair.
Rock Auto has it for about $85 .
When I bought it, it was a re-packaged FIAT/Mopar part re-packed in a Standard Parts box
Rock Auto 5% off Code: 236213012213327337
Enter code in box at checkout "how did you hear about us"?
Code good until July 28 2023
![Image]()
Try replacing the Vapor Canister Purge Valve with Standard Part #CP791
Over time, that part goes bad (along with the evac pump which you replaced).
Just to keep things interesting, the purge valve also "throws" the same "0456 small emission leak" CEL's
It goes under the hood, behind the engine, topside = 15 minute repair.
Rock Auto has it for about $85 .
When I bought it, it was a re-packaged FIAT/Mopar part re-packed in a Standard Parts box
Rock Auto 5% off Code: 236213012213327337
Enter code in box at checkout "how did you hear about us"?
Code good until July 28 2023
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48 Posts
Any updates? My 0456 came back again after being of for more than a month. Changed the gas cap, was fine for over a month, now CEL back on.just to update the thread - i replaced the evap leak detection pump (circled in red) last tuesday. since then i 've put a bit over 30 miles on it and the P0456 is still there.
given that its a permanent trouble code (since its related to emissions), i'm thinking that it might take some more drive cycles for it to go away.
i can fill the tank all the way up as well and see if that helps (i'm at about 3/4 tank).
if the code still doesn't go away, i'll go about inspecting some of the hoses and update as to what i find.
fun times
![Image]()
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