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On a 1998 chevy blazer zrz 4 x 4 i get the code of p0452 evap emmission control system pressure sensor low what does this mean? how do i solve this problem? also, when i push in the clutch it makes a lower ticking noise. what could this be?

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  • tonyaevatt Jul 11, 2009

    i think this will help me. this confirmed the bearing issue i thought it had in the clutch. thanks so much. this has helped me greatly



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P0452 indicates a low voltage signal from the fuel tank pressure sensor, which converts fuel tank pressure into a voltage signal sent to the ECM.

Evaporative Emission Control System Pressure Sensor Low Input indicates a low voltage problem in the Fuel Tank Pressure Sensor (FTPS). What the fuel FTP sensor does is convert fuel tank absolute pressure into electrical signals and inputs the signal to the ECM/PCM, (Computer). First thing to do is make sure the gas cap is good and tightened properly. Given the gas cap's age, you may just want to replace it as the seal may be dry and leaking which would give you a low pressure signal. Then check the vacuum lines and wiring at the FTPS (Location-Fuel Tank) to be sure they are good, clean and tight. Barring a wiring problem it can be a bad FTPS.

Regarding the noise from clutch, it seems to be a bearing issue or the clutch plate/pad might have worn.

Hope i helped.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Jul 11, 2009


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The sensor is on top of the tank and you will have to remove the tank. But your symptoms are pointing to more than just the sensor. You may have wiring problems.

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