P0455 Code-Meaning, Symptoms, Causes, Repair Cost, How To Fix?

The p0455 code is a fairly straightforward OBD-II trouble code. The code depicts that the engine computer has detected a large leak in the engine evaporative emissions control (EVAP) system. Let’s get an in-depth format of the trouble code in this article.

Meaning Of P0455 Code?

The (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 flow of the gas vapors from the charcoal canister to the engine air intake is controlled by a purge valve.

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.

What Are The Symptoms Of The P0455?

You may find such symptoms mentioned below if you’re facing this trouble code issue:

1. Fuel smell near gas tank filler neck, gas cap, engine compartment, and/or near charcoal canister

2. Decreased fuel economy

3. Incomplete EVAP system monitor

4. Check engine light is on.

What Causes The Code P0455?

The leak can be caused by a variety of components. The most common is related to the fuel filler cap which could be missing, not correctly installed, not sealing properly, or maybe damaged to the top of the filler neck.

The next most frequent problem is a leak in a hose. Hoses on the breather system tend to crack with age including the large connecting hose on the filler neck to the tank. The Evaporative Emission System has a purge valve to regulate pressure in the system and this will need to be checked by a technician.

Vehicles with a charcoal filter on their evaporative system need to check the filter for cracks, damage, or leaks. The fuel tank itself may be leaking or the gasket where the fuel level sensor, pressure sensor, and fuel pick attach to the tank may be leaking.

How Serious Is The Code P0455?

The system leak failure can cause excessive fuel consumption in certain circumstances. It is best to take your vehicle to a technician to reset the fault codes. Oftentimes, if the Check Engine Light came on immediately at startup, the OBD-II system can be reset and the vehicle will operate normally.

How Much Does It Cost to Fix Code P0455?

Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0455 code.

How Do I Fix Code P0455?

If you’d like to try to fix code P0455 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis.

Step 1:-

Inspect your gas cap to see if it is loose or damaged. If your gas cap is loose, tighten it and clear the code. Try replacing the gas cap anyway if you’re unable to see any gas cap failure indications. Gas caps are relatively inexpensive and are often the fix for code P0455.

Step 2:-

The check engine light should turn off on its own and the trouble code erase from memory after a few drive cycles. If you have access to an OBD-II scan tool, you can manually turn off the check engine light and erase the P0455 trouble code.

Step 3:-

Perform an EVAP system leak check. To do this, pinch off the vent tube to the EVAP Vent Control Valve. Pressurize the EVAP system with an EVAP smoke machine leak checker. Check to see if you see any smoke leaking out from any hoses or seals.

Step 4:-

If the EVAP hoses too appear to be in good condition, not loose and not disconnected. The next step will require the use of proper diagnostic tools and is best left to a technician to handle.

NOTE:- Don’t overlook a loose or faulty gas cap as this is the most common culprit. That causes the check engine light to come on for this code.


We hope the above-mentioned information about the p0455 code will be helpful to all the readers. If anybody’s doubts persist feel free to comment in the comment section below. We’ll try to solve the doubts as soon as possible.

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