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Code P0453. Evaporative Emission Control System (EVAP) Pressure Sensor High Input

Code P0453 means: Evaporative emissions control system (EVAP) pressure sensor high input.

This diagnostic trouble code (DTC) is a generic code. Error P0453 is considered a generic code because it applies to all makes and models of vehicles.

The code indicates that part of the EVAP control system is no longer working correctly. The EVAP system consists of many parts, including the tank cap, fuel lines, carbon tank, air valve, and others.

EVAP System Operation

The emissions control system (EVAP) Prevents fuel vapor from escaping from the vehicle’s fuel system. Fuel vapors are sent through hoses to a charcoal canister for storage.

Later, when the engine is running, the purge control valve opens, allowing fuel vapors to enter under vacuum.

The exit of the gases from the EVAP container is controlled by a valve that allows them to be directed directly to the engine intake through a negative pressure differential.

The EVAP pressure sensor allows the PCM to monitor the pressure in the EVAP system. It is almost always in the fuel tank and is integrated into the fuel pump housing.

If the pressure in the EVAP system and fuel tank is outside the pre-programmed range, within a specific time period and under certain circumstances, the code P0453 will be stored and the malfunction indicator light (MIL) may illuminate.

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What is Code P0453?

A P0453 code means that the powertrain control module (PCM) has detected a higher-than-usual pressure in the evaporative emissions system (EVAP).

In case you are not familiar with this term, EVAP It is the system that allows vapors from the fuel tank to be directed to the engine and burned, instead of being vented into the atmosphere, where they would cause harmful emissions.

The EVAP system In most vehicles it has a pressure sensor, which monitors the entire process. Sometimes the EVAP system performs a pressure test to determine if there are leaks in the system. It achieves this with the help of the pressure sensor.

So, if the pressure exceeds 4.5 volts, the sensor transmits information to the PCM indicating that the pressure is extremely high. In this way, the P0453 code is activated, indicating a failure in the system.

Symptoms of Code P0453

The main sign that a P0453 error has occurred is when the “light activates. Check Engine”. However, this light does not tell you the code number that is presented, and you will have to connect a scanner to identify it.

Additionally, you may notice some or all of the following symptoms:

  1. The smell of fuel may be present in some cases.
  2. A slight decrease in engine performance.
  3. A slight increase in fuel consumption.
  4. In most cases, you won’t notice any symptoms other than an illuminated check light (MIL).

The severity level of the P0453 code is medium. The car can continue to be driven, but harmful emissions will increase. Which, in practice, will not allow the vehicle to pass the emissions test.

Causes of Code P0453

There are several factors that contribute to this fault code. They include:

  • Fuel tank pressure (FTP) sensor open signal wire.
  • Short to voltage in FTP sensor signal wire.
  • A faulty FTP sensor.
  • Unusually high pressure in the fuel tank as a result of a blockage in the EVAP purge hose or an overfilled fuel tank.
  • Loose or damaged FTP sensor connector.
  • Ground loss to sensor.
  • Broken wiring harness.
  • The fuel tank safety valve is clogged.
  • Cracked or broken charcoal canister.

How to Diagnose Code P0453?

Let’s see what you can do to diagnose the problem.

1. Perform a visual inspection

Often the biggest culprits for this fault code are damaged or corroded wiring and a disconnected sensor. Therefore, the first step should be to inspect the wiring and the pressure sensor EVAP control system.

Look for the EVAP canister under your car. You will find it connected to the fuel tank or as a separate unit that has hoses that extend to the fuel pump in the tank.

Inspect the EVAP and verify that the pressure sensor connector is properly seated and engaged. The main thing to look for in the connector and cables are signs of corrosion or wear.

The next step is to disconnect the sensor and check the status of the pins on the terminal. Ideally, they should be clean and without traces of moisture.

Check all wiring from the sensor and determine if there are breaks in the wiring insulation. Note that you may have to remove the electrical tape to inspect the wiring.

2. Test the output voltage

Make sure there is 5 volts on the test lead and check the ground circuit for continuity.

Check the sensor signal wire with a multimeter to determine the voltage, it should be approximately 3 volts.

Remove the hose connected to the EVAP pressure sensor and create a vacuum with a vacuum gauge, monitoring voltage changes on the multimeter. If the voltage changes when the vacuum is applied, the sensor is working. If the voltage does not change, the sensor is defective.

Perform a motion test to determine if there is a problem. When shaking or twisting the wires, watch the multimeter readings for voltage fluctuations.

If the voltage rises or falls sharply when you move a section of wire, you probably have a break that needs to be repaired.

If the shake test fails, disconnect the EVAP pressure sensor and check the voltage. If the voltage remains high with the sensor disconnected, check the wiring harness for a shorted signal wire.

If the reference voltage and ground readings are good, the problem is most likely a faulty EVAP pressure sensor. Therefore, you will need to replace it to fix error P0453.

Sometimes when the sensor is disconnected, the high voltage disappears, the ground circuit is fine, and the reference voltage is correct.

This indicates that the EVAP purge hose is clogged. Disconnect the hose from the bleed valve and blow with compressed air. If the blockage cannot be cleared, replace the hose.

3. Try the scanner

If you are using a scan tool, the first step is to obtain an EVAP pressure sensor reading from the freeze frame data.

As in the previous case, the key must be in the on position, but the engine must be off. The reading you get from the EVAP pressure sensor should be in the 3-volt range.

If the ECM still shows the code P0453 and you haven’t gotten an unusual voltage reading, when you use the multimeter or scan tool, you probably have an intermittent problem.

You will need to perform a shake test on the wiring to verify that there are no communication problems between the sensor and the ECM.

Move the circuit and keep track of the voltage reading on your scan tool. If you notice that the voltage increases or decreases as you swing the cable, you may have a break in the cable.

Once you repair the wire, you will get a normal voltage reading.

How to Fix Code P0453

Some suggested troubleshooting steps to fix error code P0453 are as follows:

  1. Repairs damaged EVAP lines.
  2. Repairs the voltage supply circuit to the EVAP pressure sensor.
  3. Repair the circuit that goes to PCM.
  4. Repair or clean the connector.
  5. Replace the EVAP pressure sensor.
  6. Repair restriction in EVAP line.
  7. Replace the PCM if the situation requires it.

Is Code P0453 Serious?

It’s really not that serious unless you need to perform the emissions test right around this time. You will not pass it with this code activated.

The code is P0453 does not affect the driving of the car, and there is no noticeable decrease in engine performance either. Therefore, it is considered that it is not that serious and that you will be able to get home by driving.

You can even use the car for several days in these conditions, although we do not recommend it so that it does not affect other systems in your car.

Sometimes this code is triggered by a momentary overpressure in the system and then clears itself on the next cycle. This intermittency is common in some car models, but it is not serious.

How to Avoid Code P0453?

The code P0453 indicates overpressure in the system but may be a bad signal from the pressure sensor. In both cases, you can’t do anything to prevent it, only act to repair and normalize the system.

Sometimes, this bad signal from the sensor can be caused by poor contact in the circuit, something quite difficult to identify if the fault has not yet occurred.

And if the failure occurs directly in some actuator of the system, it is even more difficult to identify any failure before it happens. Luckily, it is a failure that is not serious and that gives you some time to repair it without considerably affecting the operation of the car.


You may also be interested in Error Code P0457 OBD – A leak is detected in the evaporative emissions control system

P0453 is a fault code that indicates that the pressure in the evaporative emissions system is higher than normal.

This can happen for several reasons, such as a damaged fuel tank pressure sensor, an open or shorted signal wire, or a damaged sensor connector.

The best solutions for this error code involve inspecting the EVAP system and testing the output voltage.

If you want to know other articles similar to Code P0453. Evaporative Emission Control System (EVAP) Pressure Sensor High Input You can visit the category Fault Codes.


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