P0452: Evaporative Emission System Pressure Sensor Low Input

written by Edmunds.com^{This story was created with generative AI and was reviewed and fact-checked by our staff of editors and experts.}
edited by Nick Yekikian^{Senior News Editor
Nick Yekikian has worked in the automotive industry since 2019. He has written close to a thousand car-related articles and tested and reviewed more than 200 vehicles over the course of his career. Nick is the Senior News Editor at Edmunds and has also contributed to MotorTrend, Automobile Magazine and Super Street. When Nick isn't zipping around town in his latest used-car find, he's probably making digital art in Photoshop or playing disc golf with friends.}
1/30/2025
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What does error code P0452 mean?

The P0452 refers to an issue with the Evaporative Emission System Pressure Sensor Low Input. This code is triggered when the engine control module detects an abnormally low voltage signal from the evaporative emission (or EVAP for short) system pressure sensor. The EVAP pressure sensor monitors the pressure or vacuum in the fuel tank and EVAP system to ensure both proper operation and the containment of fuel vapors.

Why is P0452 important to address?

The EVAP system prevents harmful fuel vapors from escaping into the atmosphere, which reduces emissions. A malfunction in the EVAP pressure sensor can compromise the system's effectiveness, leading to increased emissions, potential fuel leaks, and noncompliance with environmental regulations, which can cause your car to fail a smog test. Ignoring this issue could also cause further damage to related components in the EVAP system, driving up the cost of repairs.

Can I safely drive my car with this error code?

Driving with the P0452 error code is generally safe for short distances, as it typically does not affect drivability or engine performance. However, prolonged driving may result in higher emissions and fuel vapor leaks, which can pose environmental concerns and potentially damage other EVAP system components. It is recommended that you address the issue promptly.

How do I know if there's an EVAP problem?

The check engine light is on
There's a strong smell of fuel, especially near the fuel tank
Decreased fuel efficiency
Failed emissions test

How do you diagnose P0452?

Diagnosing the P0452 code involves the following steps:

Scan for codes: Use an OBD-II scanner to confirm the P0452 code and check for related EVAP system codes.
Inspect the EVAP pressure sensor: Examine the sensor and its wiring for damage, corrosion or loose connections.
Check voltage and ground: Use a multimeter to verify the proper voltage supply and ground at the sensor.
Test the pressure sensor signal: Measure the sensor's output signal while varying system pressure to confirm it's working.
Inspect the EVAP system: Check for fuel tank damage, vent valve blockages, or leaks in the EVAP system.