Toyota Corolla P0455: EVAP System → Leak Detected (Large)
This is one of the most commonly encountered trouble codes for the Toyota Corolla Is the Code P0455. The trouble code is the number given when you connect your Corolla to an OBD2 scanner. This has to do about the emissions system. If there are any problems, P0455 indicates they have been fixed. Leakage large In the evaporative emissions control system (EVAP). You will often see it with other codes like P0420 or P0430.
P0455: EVAP System → Leak Detected (Large)
Your Corolla is usually not at risk from P0455. Certainly anytime the service engine soon light is on, it’s good to deal with it as soon as possible though.
Toyota Corolla P0455 Definition
The universal OBDII trouble code P0455 can be used to diagnose any problem. The code can be used regardless of the make and model of your vehicle (Corolla, or otherwise). Technically, the code stands for:
System Gross Leak Evaporative Emission System
The EVAP captures any fuel vapor in the fuel tank. They are then sent to the engine intake for ignition. When there is a large leak in the Toyota Corolla’s EVAP system, it will throw the P0455 OBDII Code.
Toyota Corolla P0455 OBDII Code Symptoms
A P0455 Code will usually not cause any symptoms except the ones listed below. Smells like gas The service engine soon light. It is possible to notice a slight dip in fuel economy.
Particular attention should be paid to the fuel tank or fuel filler tube smell.
The EVAP system is responsible for fuel vapors. If these vapors are leaking from the system, you’ll often smell them faintly while operating the vehicle.
Corolla P0455 Trouble Code Causes
P0455 can occur in many Toyota Corollas. The most frequent problems that trigger this code are:
- Evap Hose– The hose that carries the fuel vapor from the fuel tank to the intake manifold can begin to leak. This can lead to the P0455 code. You should look for a hole or a tear in the code. This is the main problem that can cause the code.
- Vapor Canister Purge Valve– One of the most common causes of the P0455 code is the vapor canister purge valve. It’s really easy to replace. There are some clips you will need to look for and then remove.
- A Faulty Canister of Charcoal– The charcoal canister is often the cause of P0455.
- Fuel Tank Sending Unit– It is possible for the gasket that attaches the fuel sending unit to the gas tank to go bad. This could cause a drop in tank pressure which can throw off the code.
- Capacity for Fuel– A bad fuel cap can cause the code to be thrown for sure. Often, you’ll get a message informing you that the fuel cap is off even when it is on. You may not get the message but a P0455. This will save you time and money.
- Fuel Filler Neck– There is often a gasket where the fuel filler neck connects with the gas tank. The gasket may dry out especially if the vehicle is in dry conditions. When it dries out, the fuel tank can’t hold pressure anymore.
Toyota Corolla Diagnosis - P0455
To diagnose the problem with your Toyota Corolla's P0455, a mechanic can use a variety of tools. These are some of the common diagnostics that can be done for the code
- The mechanic will usually check for any trouble codes. A mechanic will usually check for additional trouble codes to help diagnose the problem. That’s because when they appear together in certain combinations, there will often only be only a few conditions that will throw any combination of codes at one time.
- The mechanic will normally determine what trouble codes are associated with P0455. Check out the EVAP System. It includes the purge valve and line as well as the canister.
- A mechanic will examine the gas cap and verify that it is able to withstand high pressure. If you are getting a warning that your gas cap is off, even when it’s on, replacing it will more than likely clear this code.
- Monitor and check the pressure in your fuel tank.
- The mechanic will then perform the following tests after completing the above-mentioned checks:
- A smoke test, and they’ll use a scan tool to confirm that the EVAP solenoids and valves are operating properly.
Here’s a pretty good video on diagnosing these leaks from Scotty Kilmer, if you are interested:
While the trouble code may state that there is a “large leak” in the EVAP system of your Toyota Corolla, the actual leak will most likely still look rather small. The “large” really is referring to how much pressure is being lost.
Most common P0455 fixes
These are some of the most popular Corolla P0455 fix:
- Replacing the gas cap
- Replacement for EVAP Line
- Replace charcoal canister
- Change the fuel tank
It is best to begin with the gas cap, and then work your way up to the fuel tanks. The gas cap is the most difficult and cost-effective item to replace.
Here’s a great video on How to test your gas tank.
You will need to solve the problem quickly. This should help. Please feel free to add anything below.
Are P0455 Serious Concerns?
While P0455 is not going to cause the Corolla’s engine to stop running, it should not be treated lightly. Fuel leaks could be a problem. You should pay extra attention to the level of your fuel tank and ensure that you're not leaking fuel. It is best to have it checked and/or dealt with immediately.
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