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Many modern evaporative emission (EVAP) systems are equipped with a pressure sensor (or fuel tank pressure sensor) that monitors the EVAP system. Code P0454 is an engine error code that’s related to a fault in this system. It’s logged when your vehicle’s powertrain control module (PCM) detects an intermittent pressure sensor signal. Know more about this code through this article.

What Does the P0454 Code Mean?

Diagnostic trouble code (DTC) P0454 stands for “Evaporative Emission System Pressure Sensor/Switch Intermittent.”

The EVAP System

A typical EVAP system consists of a charcoal canister, a purge valve/solenoid, a vent control valve/solenoid, an EVAP emission pressure sensor, as well as other metal tubes and rubber hoses. The EVAP pressure sensor, also known as the fuel tank pressure sensor, is located on or inside your vehicle’s fuel tank.

Fuel Tank Pressure Sensor
EVAP fuel tank pressure is monitored by your PCM using an EVAP pressure sensor.

Your vehicle’s powertrain control module (PCM) uses a purge valve to pull fuel vapors from the canister into the engine.  This makes it possible for fuel vapors to be drawn into the engine at the right time (when they can be burned as fuel) instead of polluting the atmosphere.

EVAP fuel tank pressure is monitored by your PCM using an EVAP pressure sensor. Once it detects that the EVAP pressure signal being sent is intermittent, it will trigger the P0454 code along with the check engine light.

Note: The definition of code P0454 could be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What Are the Common Causes of the P0454 Code?

What Are the Common Symptoms of the P0454 Code?

In most cases, you might not notice any symptoms associated with this trouble code other than a slight decrease in fuel efficiency. But just like any other trouble code, your check engine light will be illuminated once the error code is logged.

How To Diagnose the P0454 Code

Error code P0454 is a generic trouble code which can be logged in various makes and models. While the symptoms of this trouble code can be similar across different vehicles, this doesn’t mean that there’s only one way to diagnose the code’s underlying cause. The process usually varies depending on the vehicle’s specifications.

If you’re not familiar with OBD codes and vehicle repair, it’s best to leave the job to a certified mechanic. However, if you’re a seasoned DIYer, you can attempt to do it yourself.

Here’s a video to help you get an idea of what the process might involve:

How to Fix the P0454 Code

Like any other trouble code, fixing the P0454 trouble code is no easy task. If you’re not equipped with the DIY knowledge and tools to get the job done, it’s a good idea to leave the job to a certified mechanic. If you plan on resolving this DTC on your own, make sure to do your research beforehand. It helps to brush up on vehicle-specific repair information before taking on the job. We recommend consulting repair manuals like those from Chilton or an online repair database like an ALLDATA subscription.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

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