Evaporative Emission Control System Pressure Sensor Low Input
What does P0452 mean?
The P0452 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission Control System Pressure Sensor Low Input. This is a low severity code.
Common Symptoms
- Check Engine Light illuminated
- No noticeable drivability symptoms
- EVAP monitor will not complete
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Faulty fuel tank pressure sensor outputting low voltage Very High
- Open or shorted ground wire in FTP sensor circuit High
- Corroded or disconnected FTP sensor connector Moderate
- ECM internal fault on FTP input circuit Low
Step-by-Step Diagnostic Procedure
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Check FTP sensor voltage on a scan tool -- voltage below 0.1V with cap off indicates a fault
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Inspect the FTP sensor connector for corrosion, water intrusion, or bent pins
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Measure voltage at the FTP sensor connector -- should have 5V reference and good ground
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Check signal wire for short to ground using a multimeter with the sensor disconnected
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Replace the FTP sensor if 5V reference and ground are confirmed good at the connector
Frequently Asked Questions
Can I drive with code P0452?
Yes. Low FTP sensor input does not affect engine performance or drivability. It will prevent the EVAP monitor from completing and cause an emissions test failure.
What voltage should the FTP sensor read?
With the gas cap off (atmospheric pressure), the sensor should read approximately 2.5V. With the cap on and the system sealed, it should vary between 1.0V and 4.0V during normal operation.
Can water damage cause P0452?
Yes. The FTP sensor connector is often located near the fuel tank where it is exposed to road spray. Water intrusion and corrosion are common causes of low voltage readings.