Question about 2005 Chevrolet Cavalier
This might help you to better understand the EVAP system and help diagnosing the code that was set. Basically there is a leak and you need to find it. Could be very hard to find without a smoke machine. I would take it into a shop to have it tested with a smoke machine and go from there. Some people might say to just replace the gas cap, but if that's not what it is, there is $20-30 wasted, when it could have been put towards an actual diagnoses that will actually help you to fix the problem
DTC P0455 System Description
The control module tests the evaporative emission (EVAP) system for a large leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the control module commands the EVAP canister purge solenoid valve OPEN and the EVAP canister vent solenoid valve CLOSED . This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge solenoid valve closed, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum level. If the system is unable to achieve the calibrated vacuum level, or the vacuum level decreases too rapidly, this DTC sets. Hope i didn't confuse you.
Posted on Feb 02, 2010
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Posted on Jan 02, 2017
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