P0453 Troubles with the FTP

While driving your vehicle, if the Check Engine Light suddenly illuminates, it might have something to do with the P0453 trouble code, otherwise known as the EVAP system pressure sensor high input. Since there are no other symptoms for this code, in some cases a faint fuel odor might be intercepted, the Check Engine Light (MIL) was invented.

The troubles are registered in the fuel tank pressure sensor, FTP on short. This sensor is incorporated in the EVAP system (Evaporative Emissions Control System). So let’s discover what sets off this code and more importantly how drivers can fix the malfunction.

The integrity of the EVAP system, which instead of letting fuel vapors being emanated into the atmosphere and cause pollution it sends them to the engine to be burnt, is controlled by the FTP. On periodical basis, a pressure test is run down by the EVAP system for making sure that there aren’t any leaks occurring.

The pressure is considered as being normal when it registers a value of 4.5 Volts. When the FTP registers a higher value than the normal one, the PCM sends the signal for the P0453.

P0453 Causes

When it comes to the P0453 code alerting drivers that something is happening with the fuel tank pressure sensor, one of the following causes might lead to that:

  • One highly possible cause would be that the FTP signal wire is either open or possibly short to voltage,
  • Failure in the FTP,
  • The tank might be overfilled or the EVAP purge hoses are blocked, which means that there is an insane high pressure,
  • The FTP connector is damaged.

P0453 Solutions

Before being able to apply the solution, you must be able to identify what’s causing the malfunction in your vehicle. For that you need a scan tool. This instrument will show you the value registered by the FTP with Key on Engine off. As already mentioned the value should not exceed 4.5 Volts in the case of normal pressure. In the case of atmospheric pressure, 2.5 Volts should be the value indicated by the scan tool.

And now the reasons for which these values are so important in applying the appropriate solution:

  • If you remove the gas cap and the shown value is 2.7 Volts then it’s an intermittent problem. In order to probe this theory, use a Digital Volt Ohm Meter to perform a wiggle testing on the connector. If during this wiggle testing the voltage is fluctuating then it’s definitely a malfunction in the connector. Possible malfunctions are: broken wiring or water penetrated the connector.
  • If the value registered by the scan tool exceeds 4.5 Volts (normal pressure) most likely you will have to replace the FTP or have it replaced. However, don’t jump to conclusions before unplugging the FTP and check the voltage with the scan tool again. If the registered data is around 5 Volts and you have good ground then the FTP must be replaced.

The P0453 is easily detectable and there are only 2 solutions for fixing it so the Check Engine Light should disappear in no time.

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