P0455- Evap Emission Ctrl Sys Gross Leak Detected
P0496 Evaporative Emission Sys High Purge Flow
This is the 2 codes you requested and they say you have a leak in the emission sys.
Sounds like a dead or shorted battery.
SOURCE: check engine light came on and the code showed po455
its a evap code could be from a bad gas cap to a cracked vapor line or a bad sensor
SOURCE: the following codes show up on my 2006 chevy
All these codes indicate that maybe you lost your reference signal from the computer. What someone will have to do is check fo voltage and grounds from the PCM on the coolant temp sensor, Both 02 sensor heater circuits, the evap purge solenoid and the gas tank pressure sensor. Its possble the computer failed or you poped a PCM fuse in the fuse box under the hood. The cover should have a legend to tell you which is which but I would pull all of them and inspect anyways.
SOURCE: 2005 chevy Z71 check engine code PO449 and PO455 5.3 Lt engine how do i fix them
get a new gas cap your evap sytem isnt working if the gas cap doesnt work then you might have a leak and check your EVAP purge valaves
SOURCE: what is code PO496 and PO455 for a 2007 Pontiac Grand Prix mean
P0496 is not alisted code.
P0455 - Evaporative Emission Control System Leak Detected Gross Leak (fuel vapors)
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
Possible causes
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
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