P0450 Code: EVAP System Pressure Sensor/Switch A Circuit
🟢 Low severity · drivable
Safe to drive — this is an emissions-sensor circuit fault and shouldn't affect how the car runs.
What P0450 means
The EVAP pressure sensor, which measures pressure in the fuel vapor system, is sending a signal the computer can't trust. The fault is in the circuit — the sensor, its wiring, or the connection.
Symptoms
- Check engine light is on
- Possible faint fuel smell
- Usually no driving symptoms
Common causes
- most common: Faulty EVAP pressure sensor
- common: Damaged wiring or loose connector
- common: Corroded connector pins
- rare: Faulty PCM
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect and clean the connector and repair any wiring damage | Yes | $20–100 |
| Replace the EVAP pressure sensor | Yes | $40–150 |
| Have the PCM checked if the sensor and wiring are good | Mechanic | $100–200 |
Frequently asked questions
Can I drive with a P0450 code?
Yes. This is an emissions-system fault and shouldn't affect how the car drives.
What does P0450 mean?
The computer lost a usable signal from the EVAP pressure sensor, so it can't monitor fuel vapor pressure.
How much does it cost to fix P0450?
$40–150 for a new sensor, plus a small amount for wiring repairs if needed.
Related codes
P0454
P0454 Code: EVAP System Pressure Sensor/Switch A Circuit Intermittent
P0452P0452 Code: Evaporative Emission Control System Pressure Sensor Low Input
P0455P0455 Code: Evaporative Emission Control System Leak Detected (Large Leak)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.