P0455 Explained - Large EVAP Leak (Simple Fix)

The FIXD wireless OBD2 scanner and free app for iPhone and Android translates your check engine light into plain English so you can rest easy. In this video, we explain what OBD2 code P0455 means and possible causes.
P0455 means a large leak in your evaporative system. The evaporative emission control (EVAP) system prevents fuel vapors from escaping into the atmosphere. The fuel vapors from the fuel tank are absorbed and stored by charcoal pellets in the charcoal canister. The vent control valve is controlled by the engine control module (ECM) and allows air to flow into the charcoal canister to purge the gas vapors into the engine air intake to be burned. The flow of the gas vapors from the charcoal canister to the engine air intake is controlled by a purge valve. The vent control valve is normally opened when the engine is on, and the purge volume control valve is normally closed and is controlled by the ECM to open when it is ready to purge the stored fuel vapors from the charcoal canister.
However, the ECM occasionally performs leak tests to ensure the evaporative emission control system is working properly when the vehicle is turned off. During the leak test, the ECM closes the vent control valve to create a sealed EVAP system. If the EVAP system does not maintain the pressure, the ECM recognizes an evaporative emission control leak. In the case of P0455, it is a very large leak. This is usually indicative of a loose, broken, or missing gas cap.

0:00 P0455 - Large EVAP Leak
0:04 P0455 is caused when there is a large leak in the EVAP System
0:16 What is the EVAP System?
2:00 Results of a P0455 code
2:15 Possible Causes of P0455
2:35 Visit our blog to learn more about P0455
2:44 Happy Driving!

#FIXD #P0455 #checkenginelight

[zachcaulder]

Checked the gas cap and that was it. I had this same problem about 6-7 years ago. took the car to a local dealership, they fixed it and charged me $60.00.. I am so glad I bought this little device..it has already paid for itself....

[WinstonMakes]

Used your obd scanner this morning and I appreciate that you guys went through the effort to explain all of this so clearly. The scanner and app were money well spent. 👍🏼

[TheLherrod]

The check Engine light is ON. I plugged into the port and it's the gas cap that wasn't screwed on tight. Thank guys for FIXD!!

[sbond]

This is the first time I've had a good explanation on what the purge valve does. Which could also be the problem with a P0455 I'm coming to find out.

[fly]

If a PO455 large evap leak is the diagnosis, would I be able to smell the gasoline fumes in my closed garage when my vehicle is parked in it?

[josephpellegrino]

It is a never ending problem if you have a beetle. Replaced gas cap 4 times and the purge valve and it still gives the code every 2 to 3 weeks.

[hermanrogers]

When the purging starts it is drawn into the intake manifold not the combustion chamber

[camaples]

I'm bout to fix my wife's Altima like a BOSS, thanks random internet chick!

[elbeno]

It's not always a simple fix and you know it

[saraf]

just put my extra fixd in hubby's truck with check engine light on, got P0455 code... Will let you know if what emission evap leak it is- he did say that he thinks the gas has been going out pretty fast in his truck..

[AlbertoGil-xs]

Magnífico equipo brinda un amplio servicio seria ideal para para un número mayor de clientes si los videos tuvieran subtitulos en español .

[luckyfranscetti]

Can a large Evap leak can cause reduce engine power message

[camschoice]

Got code P0457 as well as check gas cap light, replaced 18 year old gas cap lmao a few days ago, got a new code today P0455, I have an 04’ Mazda Tribute, any suggestions?

[mateogregory]

Can this cause a random misfire if you don’t fix the p0455 code

[ajd]

Can anyone tell me where the fumes go if there is a gross leak? Or better yet, how are they getting vented to the atmosphere? Trying to understand. If you're driving long distance and you get one of these leaks. Will it vent to the atmosphere for safety purposes?

[icy]

wow! had no idea how dangerous this leak was!

[philochristos]

So what if I have a P0455 along with P0420?

[scottmcgehee]

PO455 code is usually not a gas cap although it can be. Mine in a 05 ford expedition is a evap sensor above the gas tank requiring the tank to be dropped. The sensor and wire cost $850 plus labor to drop tank, not such a simple fix. A smoke test will find the culprit or maybe not. Old cars are notorious for evap codes and they can be a bitch to find and fix

[alex_canovas]

Ed lover shouting “cmon son” brought back memories

[melissadawdy]

Curious what po455 paired with po172 can be