Error Code P0455: What Should I Do?

Car fault code P0455
Car fault code: P0455
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Any error code can be a bit alarming when you first see it, especially if your OBDII scanner doesn’t automatically provide an error code definition. While it’s nice to have an OBDII scanner with this feature, you can usually find OBDII error code definitions online. 

If your OBDII scanner is showing that your vehicle has a P0455 error code, you might be panicking. Before you get too down, we have some good news for you! Typically, the P0455 error code isn’t that serious, and the most common solution to the problem is pretty simple. 

Before you can resolve this error code, it’s important that you know what’s going on behind the scenes.

What exactly does the P0455 mean?

Additionally, we’ll soon go over all of the potential causes, symptoms, and solutions regarding this common error codes. 

What Does Code P0455 Mean?

This is a generic error code, meaning that it can appear in a wide variety of vehicles from different vehicle manufacturers. Whether you’re driving a Nissan, a Ford, Chrysler or a Chevy, you could potentially encounter the P0455 error code. 

To understand the P0455 error code, you first need a basic understanding of the evaporative emission control system (EVAP) and the engine control module (ECM).

Basically, these two systems work together in order to keep gasoline vapor from escaping your vehicle. If you’re getting the P0455 error code, it means that an unusually large amount of gasoline vapor is escaping from your vehicle. 

Not only is this environmentally hazardous, but it actually has a severely negative effect on your fuel economy. In other words, your gas will not last as long. To keep your vehicle eco-friendly, continue reading and learn how to resolve this common issue. 

What Causes the P0455 OBDII Code?

Loosing gas cap is the common cause of the P0455 trouble code.
Loosing gas cap is the common cause of the P0455 trouble code
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As previously stated, this error code is first and foremost caused by an excessive amount of gasoline vapor escaping from your vehicle. 

Naturally, you’re probably wondering why your vehicle is losing its gasoline vapor so easily. Luckily, the most common reason for this error code is very easily corrected.

More often than not, the P0455 error code is simply caused by a broken or loose gas cap. Gas caps are designed to create a seal and, consequently, a vacuum. This keeps gasoline vapors in your vehicle, where they belong. 

However, when the gas cap is damaged, there’s nothing creating a seal and vacuum in your gas tank. As a result, gasoline vapors can easily escape your gas tank, often resulting in a Po455 error code. 

Additionally, there are a few other vehicular parts that, if damaged or defective, can cause the P0455 error code. It’s worth mentioning that these potential causes are far less common.

A faulty or damaged vent control valve, purge valve, EVAP hose, or charcoal canister can all result in the P0455 error code.

The reason for this is rather simple. All of these parts play a role in your fuel system, and when they become damaged or defective, gasoline vapors can easily escape your vehicle. 

What are the Symptoms of the P0455 Error Code?

If you’re not totally sure whether or not the P0455 error code is present in your vehicle, here are a few common symptoms that should help you diagnose the problem with more certainty.

The most obvious tell-tale sign is the noticeable smell of gasoline. If you didn’t just fill up your gas tank and you still smell gasoline, either gasoline or gasoline vapors are escaping from your vehicle. 

Additionally, you might notice that a full tank of gas isn’t lasting as long as it usually does. This is another symptom that could definitely indicate the presence of the P0455 error code in your vehicle. 

Lastly, if the P0455 error code is present in your vehicle, your check engine light will most likely be on. This is a rather common symptom of this error code, but an illuminated check engine light could indicate a very wide variety of issues. 

P0455 OBDII Error Code Solutions

Resolving the P0455 error code is pretty simple on paper, but the level of difficulty that you experience really depends on your level of expertise. If you’re not confident in your ability to fix this problem, it’s probably best to contact a professional mechanic.

That being said, even novice mechanics shouldn’t have too much trouble resolving this issue.

Honestly, in a best-case scenario, this issue can be resolved simply by tightening your gasoline cap.

Alternatively, an equally simple yet slightly more expensive solution is replacing the gas cap. If your gas cap is damaged, this is the route you’ll need to take in order to clear this error code. 

Additionally, there are several other parts that, if damaged, need to be replaced in order to resolve the P0455 error code. Specifically, to resolve this error, you’ll need to replace your vent control valve, purge valve, EVAP hose, or charcoal canister if any of them are faulty. 

If all of these components are in good condition and working as they should, you should no longer see the P0455 error code. 

The P0455 OBDII Error Code Simplified

Luckily, the P0455 error code has several simple solutions. Generally, this error code isn’t too serious, so there’s probably no need to panic. In most cases, you’ll be able to fix this problem yourself by simply tightening or replacing the gas cap.

In other cases, when other parts need to be replaced, resolving this problem can be slightly more complicated. However, replacing these parts is still a relatively simple task compared to a lot of the more serious error codes. 

There’s more good news! If you’re not confident enough in your mechanical expertise, having these issues resolved by a mechanic is relatively inexpensive. In the vast majority of cases, this error code is nothing to panic about.  

Read more another OBD2 code: Error Code P0340: What’s the Solution?

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