P0454: Evaporative Emission System Pressure Sensor/Switch A Circuit Intermittent
What to do
Driveable. Note whether the light comes and goes, and whether it correlates with rough roads — that points at a connection rather than the sensor.
What this code means
The fuel tank pressure sensor signal is dropping out or jumping erratically. Intermittent faults in this circuit are usually mechanical — a connector that has corroded at the pins, or a harness chafing where it runs near the tank straps.
Because the sensor is often mounted on or in the tank, access can be poor enough that the connector is worth testing thoroughly before any decision to drop the tank is made.
Likely causes
Start here
- Corroded or loose connector · easy
- Intermittent open in sensor wiring · moderate
- Faulty fuel tank pressure sensor · moderate
Less common
- Road damage to underfloor wiring · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
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