P0453 - EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR HIGH INPUT

The EVAP system (The evaporative emission control system) is the one that allows the vapors from the fuel tank to be purged and burned by the engine, so they are not expelled into the atmosphere as emissions that can damage the environment. This system consists of a pressure sensor, the FTP (Fuel Tank Pressure), this sensor checks the proper functioning of the EVAP system.

The Evaporation System (EVAP) periodically performs a pressure test, which checks that there are no leaks in the system. When the PCM (Powertrain Control Module) detects higher values than normal pressure, i.e. above 4.5 volts in the EVAP system, it activates through the FTP (Fuel Tank Pressure) sensor the DTC code P0453.

• The Check engine light is on.
• There is a strong smell of fuel.

A Generic DTC code P0453 may be caused by one or more of the following problems:

• The signal cables of the FTP (Fuel Tank Pressure) sensor may be defective, which could cause a short circuit.
• The FTP sensor may be defective.
• The pressure level in the fuel tank is off the charts. This may be due to a clogged or disconnected EVAP (The evaporative emission control system) hose.
• The fuel tank may be excessively full.
• There's ground loss on the FTP sensor.

To solve the OBD2 code P0453, you can check the following components:

• Check that the fuel cap is in good condition.
• Perform a KOEO (Key on engine off) test. Remember that the normal value is usually close to 2.5 volts at atmospheric pressure and taking into account that in some cases it can change due to the altitude, but it should not be higher than 4.5 volts.
• If it is close to 2.7 volts with the fuel cap fitted, this indicates that the problem is intermittent. Therefore, using a multimeter, you should measure the voltage in the signal cable, and at the same time, move the sensor connections and wires. If the voltage varies, check the connections for water or broken or worn wires. Replace them if necessary.
• If the value displayed by the tool is higher than 4.5 volts, disconnect the sensor and check that this voltage is present again. If the problem persists when the sensor is disconnected, check the cables as they may be defective. If the high voltage disappears when the sensor is disconnected, make sure there is a good ground for the sensor and the reference voltage (5 Volts) is adequate. If it is within these parameters, you can change the sensor as it indicates that it may be short-circuited.