P0453
Evaporative Emission System Pressure Sensor High Input
The fuel tank pressure sensor signal is above the expected maximum voltage, typical of a short to supply or a sensor that has failed high.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Common causes
Ordered by how often each turns out to be the cause.
- Tank pressure sensor failed (high)Common
Parts involved
- Fuel Tank Pressure Sensor
- Sensor Wiring
P0453 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.