P0454 — Evaporative Emission Control System Pressure Sensor High Input
Can drive — fix at your convenience.
What P0454 means
This code means the EVAP pressure sensor is sending a voltage signal that's higher than the expected range, so the computer can't accurately read fuel tank vapor pressure. Common causes include a faulty pressure sensor, an intermittent wiring or connector fault, or an open circuit in the sensor's signal line. The usual fix is replacing the sensor or repairing the wiring, and it's typically an affordable, straightforward repair.
Common symptoms
- Check engine light is on
- Car drives normally with no power loss
- Possible slight fuel smell near the tank
- Failed emissions or smog inspection
- Other EVAP-related codes may also be stored
Common causes
- Faulty EVAP pressure sensor
- Open or broken wiring in the sensor signal circuit
- Corroded or loose sensor connector
- Short to power in the sensor circuit
- Faulty engine control module (rare)
Typical repair cost
$100 – $300
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0454 code?
Yes, it's generally safe to drive. This is an emissions code that doesn't affect how the car runs or your safety. Still, get it checked within a week or two, since you'll likely fail an emissions test until it's fixed.
How much does it cost to fix a P0454?
Expect roughly $100 to $300. A new pressure sensor or a wiring repair is usually toward the lower end, with diagnostic time included. Hard-to-reach sensors can push the cost up slightly.
Is a P0454 code serious?
No, it's low severity. The EVAP system only manages fuel vapors, so there's no risk to the engine or drivability. The main issues are a check engine light and failing emissions testing.
What's the difference between P0453 and P0454?
They're closely related EVAP pressure sensor codes. P0453 means the signal voltage is too low, while P0454 means it's too high. Both usually point to the same sensor or wiring and are diagnosed the same way.