P0454: Evaporative Emission Control System Pressure Sensor Intermittent

P0454 means the ECU detected an intermittent fault in the EVAP system fuel tank pressure (FTP) sensor signal. The sensor is typically mounted on top of the fuel tank or in the fuel pump module and reports tank pressure to the ECU during EVAP self-tests. Intermittent codes usually point to wiring issues, a flaky connector, or a sensor in early failure.

P0454 is a evap system-related diagnostic trouble code classified as low severity. When your vehicle's ECU detects this condition, it stores P0454 and illuminates the check engine light.

If your vehicle has triggered P0454, you may notice one or more of these symptoms:

• Check engine light illuminated, sometimes flickering on and off
• Failed emissions test
• EVAP readiness monitor stays incomplete
• No noticeable driveability issues
• May appear alongside other EVAP leak codes if the sensor reading is unreliable

Here are the most common causes of P0454, ranked by how likely they are to be the culprit:

Generally yes, for short-term driving. P0454 is an intermittent sensor fault and does not affect engine performance or safety. Drive normally, but the check engine light will cause an automatic failure at any EU emissions inspection.

Follow these steps to pinpoint the root cause of P0454:

1. Read freeze frame data to see what the FTP sensor reported when the code set. Compare to atmospheric pressure (around 101 kPa). Wild swings or readings far from atmospheric indicate sensor or wiring issues
2. Access the FTP sensor. On most vehicles it is on top of the fuel tank, requiring you to drop the tank or access through a service hatch under the rear seat. Inspect the connector for moisture or corrosion
3. Wiggle-test the connector and harness with the engine running while watching live FTP data on a scan tool. Sudden jumps in the reading during the wiggle confirm a connection fault
4. Measure sensor reference voltage (typically 5V) and ground at the connector with the key on. Missing voltage or ground means the harness or ECU side has the fault
5. If wiring is good, swap in a known good FTP sensor and clear the code. Drive several cycles to confirm the intermittent fault has cleared

Repair costs for P0454 vary depending on the root cause and your vehicle. Here are typical estimates:

P0454 behaves differently depending on your vehicle. Select your car below for model-specific causes, known issues, and adjusted cost estimates:

These codes are often seen alongside P0454 or indicate related issues: