DTC P0454 Evaporative Emission Control System Pressure Sensor Intermittent

In the realm of automotive diagnostics, understanding On-Board Diagnostic Trouble Codes (DTCs) is essential for maintaining and repairing vehicles effectively. Today, we’ll delve into DTC P0454, specifically focusing on the Evaporative Emission Control System Pressure Sensor Intermittent issue. This comprehensive guide aims to decode the meaning of P0454, explore potential causes, recognize associated symptoms, outline a systematic diagnostic process, and provide effective solutions for resolving this intermittent problem. Let’s get started.

1. What Does P0454 Code Mean?

DTC P0454 is a diagnostic trouble code that points to a problem within the vehicle’s Evaporative Emission Control System (EVAP). More precisely, it signifies an intermittent issue in the Pressure Sensor Circuit. The EVAP system plays a crucial role in capturing and storing fuel vapors from the fuel tank, preventing them from escaping into the atmosphere. When the Pressure Sensor Circuit intermittently reports problems, the Engine Control Module (ECM) triggers the P0454 code, indicating an issue with the sensor responsible for monitoring pressure within the EVAP system.

2. What Are the Causes of DTC P0454?

To effectively diagnose and address DTC P0454, it’s vital to understand the potential causes of this code. The underlying factors may include:

  • Intermittent Fault in the Pressure Sensor: The pressure sensor itself may be intermittently malfunctioning, leading to sporadic issues.
  • Wiring Problems: Damaged, frayed, or loose wiring within the Pressure Sensor Circuit can result in intermittent faults.
  • Poor Electrical Connections: Loose or corroded connectors related to the circuit can intermittently disrupt the sensor’s function.
  • ECM Issues: In rare cases, problems with the ECM itself can lead to intermittent P0454 codes.

3. What Are the Symptoms of DTC P0454?

Recognizing the symptoms associated with DTC P0454 is crucial for early detection, even though they may not always be readily apparent. Common signs of this intermittent issue include:

  • An illuminated check engine light (CEL) on the vehicle’s dashboard, which may come and go intermittently.
  • In many cases, there are no noticeable drivability issues or performance problems, as the problem is intermittent.
  • Occasional faint smells of gasoline near the vehicle might be observed, but they too can be intermittent.

Addressing these symptoms promptly is essential to prevent further complications, especially if the issue worsens.

4. How to Diagnose DTC P0454?

Accurate diagnosis of DTC P0454, given its intermittent nature, requires a systematic approach. Here’s a step-by-step guide:

5. How to Fix DTC P0454 Problem?

Once you’ve identified the underlying issue causing the intermittent DTC P0454, it’s time to address it effectively. Here are steps to consider:

  • Replace the pressure sensor if it’s found to be intermittently malfunctioning and causing sporadic issues.
  • Repair or replace any wiring with intermittent malfunctions within the Pressure Sensor Circuit.
  • Ensure proper electrical connections and clean any corroded connectors associated with the circuit to prevent intermittent disruptions.
  • Clear the trouble code using your OBD-II scanner after completing repairs. This step is vital for resetting the check engine light.


In this comprehensive guide, we’ve delved into DTC P0454, the Evaporative Emission Control System Pressure Sensor Intermittent code. Understanding its significance, recognizing intermittent symptoms, identifying potential triggers, systematic diagnosis, and effective solutions empower you to confidently address this intermittent issue within the EVAP system. Whether you’re an automotive enthusiast or a professional mechanic, successfully resolving these problems not only ensures compliance with emissions standards but also enhances your automotive knowledge. Safe and smooth travels!