P0452 - EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR LOW INPUT

The diagnostic code P0452 OBD2 refers to a malfunction of the emission system. The Powertrain Control Module (PCM) takes into account the signal from the Fuel Tank Pressure Sensor (FTP) to detect changes in the internal pressure of the fuel tank. It should be noted that the position of this sensor will depend on the model of your vehicle, since it may be located in the fuel purge line at the top of the fuel tank.

When the Powertrain Control Module (PCM) determines that the emissions system pressure is below the expected level, it is not the FTP (Fuel Tank Pressure) sensor that is the only cause, as it indicates that there is a problem in the system.

The FTP sensor is mainly used to control emissions since the fuel tank usually tends to have fuel vapor pressure at the time the temperature is high, and a vacuum if the load is low. Then the Fuel Tank Pressure Sensor (FTP) sends a voltage signal to the PCM for analysis. However, the current value varies with pressure or vacuum. Although this DTC code refers to all vehicles, it has a difference in the sensor output. Likewise, all of these sensors convert pressure to a voltage, which will increase or decrease with pressure or vacuum.

• The Check Engine service light comes on.
• You can smell the fuel.

When the code P0452 is set, it means that one or more of the following problems have occurred

• It is possible that the fuel cap is not correctly positioned, or it is loose, and therefore there is a loss of vacuum.
• The Fuel Tank Pressure Sensor (FTP) wires may be shorted.
• Perhaps, there is a bad electrical connection to the Fuel Tank Pressure (FTP) sensor.
• The FTP sensor may be defective.
• A steam line may be broken into the vacuum vessel.
• A steam line can be cracked to the fuel tank.
• There may be a leak in the fuel pump.

When the fault code P0452 is set, you can do the following:

• The first thing is to inspect the fuel cap. Check that it's tight. If it is not, place it correctly and tightly. Clear the code and see if it appears again.
• If the code appears again, we can see the Fuel Tank Pressure Sensor (FTP). By using the scanner of your choice, you can observe the fuel tank pressure readings, and thus, you can also see if the Powertrain Control Module (PCM) is reading the sensor vacuum. If not, you can check the cable system, making sure that none of the cables have communication errors, wear or friction. Repair or replace one of these if necessary.
• Change the Fuel Tank Pressure Sensor (FTP).