P0452
Evaporative Emission System Pressure Sensor Low Input
The fuel tank pressure sensor signal is below the expected minimum voltage. Often caused by a failed sensor or a short to ground in the signal line.
- 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 failedCommon
Parts involved
- Fuel Tank Pressure Sensor
- Sensor Wiring
P0452 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.