P0456 Code

[JerryETX]

So I’ve been dealing with this code for many months now on my 2016 6.4 Hemi (60ish k miles). First time check engine light came on I went to Auto Zone and checked the code- P0456. They said it was likely the ESIM so I bought a new module from them (their house part) and installed it. Waited a few days and it worked. Check engine light gone. About a month later it happened again. Same code same part (warranty exchange) same results. About a month or two later happened again this time I went with a different hopefully better part. Same results. A couple of weeks ago happened again. This time I went with OEM Mopar ESIM purchased from the dealer. It’s been over a week and check engine light has not gone away.

Each time I have replaced the ESIM the check engine light has cleared (after 2 days of driving) for about a month or two then came back on except for this last time. This time check engine light is still on after 9 days.

There’s not a mechanic shop around me that I trust to try and fix this issue and the dealer has a 3 week waiting list just to get the truck in. Any ideas on what could be the issue?

 

[JohnCA]

I have had P0456 twice once for gas cap and once for the purge valve

 

[JerryETX]

I have had P0456 twice once for gas cap and once for the purge valve

Each time when you replaced these parts did you go with OEM or aftermarket parts?

 

[JW2 Innovations]

Anything to do with an error on an evaporator system, I have always struggled with it. Gas cap, purge valve, canister, canister filter......enough to drive you crazy!

I would check it all visually, and if you can't tell start with gas cap and purge valve. Cheapest parts go first if not obvious for me.

Weirdest one I ever had was the return line coming from the purge valve had rubbed another hose/something near the engine and the way they sat next to one another and their position back near the firewall it wasn't easy to see. But a hole had been rubbed into that line. I found a fuel hose of the closest I.D. and cut a small piece with some hose clamps and cut the purge return line using the small piece of rubber fuel line in it's place to seal it all up. Worked like a champ and cost me Zero.

So frustrating.

 

[JW2 Innovations]

Also note that the reason you're probably getting a delay between dash lights is that testing of that system doesn't usually happen until the car has warmed up and met some other running requirements. Dig around for what is the pre-req list before it will fire off a test. I think the last one I dealt with your fuel level had to be in a certain range as well if I remember right, temp, running over a certain rpms for so many minutes, etc. Anyways, when you reset the code it may be a bit before it fires off another test and if you haven't fixed the issue you'll just get another error code, but won't know it until the conditions to do a test are met again.

My daughters Jeep had a "small leak" once and not sure what criteria sets that code, but you would catch a whiff of gas smell when it was kicking off a test. That one ended up being the purge valve being swapped along with one piece of tubing connected to it just cause it looked degraded like it had been struck or something.

Hope you find it soon.

 

[chri5k]

It seems the ESIM is not the issue. You have a small leak in the evap system. The surest way to find the leak is with a "smoke machine". They are available on Amazon for $90 to $150. Many folks spend more than that amount on the "parts cannon" approach and still don't solve the issue. One other possibility is the ESIM is installed upside down. The ESIM uses gravity acting on a small weight as part of the system to detect a leak.

From the Standard Brand website:
Left image is correct. Right image is incorrect.



P0456 - EVAP Purge System Small Leak: When the ignition is turned OFF and the EVAP system is sealed, a change in the fuel tank vapor temperature/pressure occurs. If the ESIM switch does not close within a calibrated time, the PCM calculates a small leak of 0.02".

 

[carlucci89]

I had that code for a while too. It ended up being a hole in one of the tank lines. The dealer found it, it was not an expensive fix and has not returned.

 

[JerryETX]

It seems the ESIM is not the issue. You have a small leak in the evap system. The surest way to find the leak is with a "smoke machine". They are available on Amazon for $90 to $150. Many folks spend more than that amount on the "parts cannon" approach and still don't solve the issue. One other possibility is the ESIM is installed upside down. The ESIM uses gravity acting on a small weight as part of the system to detect a leak.

From the Standard Brand website:
Left image is correct. Right image is incorrect.

View attachment 517687

P0456 - EVAP Purge System Small Leak: When the ignition is turned OFF and the EVAP system is sealed, a change in the fuel tank vapor temperature/pressure occurs. If the ESIM switch does not close within a calibrated time, the PCM calculates a small leak of 0.02".

Interesting! I’m not near my truck but I may have installed it incorrectly looking at those images. I’ll check that out tomorrow.

 

[GTyankee]

Check your Purge Valve, it is near the throttle body & water pump

Real easy to access, pull it off & use your mouth to try to blow through it.
If you can blow through it, replace it

where it is located

2013-2016 Ram 5.7 Hemi evap purge solenoid replacement

Please use the following link when ever using Amazon.com. Any purchases you make on Amazon will help support this channel.http://amzn.to/2mALgqSFeel the need...

www.youtube.com

testing the purge valve
poor guy is slightly confused

(Ram 1500) Quick Diag of P0456 code (Evap small leak)

2015 Ram 1500 5.7L HemiShowing a quick method to verify a faulty Evap Purge Valve, by using a hand vacuum pump.Music created by "THELUFFLIFE"

www.youtube.com

 

[JerryETX]

Ended up being the purge valve. Took me a bit to get it fixed been battling tendinitis elbow but was finally able to replace the purge valve last Saturday and check engine light went off this morning. Hopefully this is the last of these issues for a while.

Thanks for the advice guys.