Question about 2006 Chevrolet Impala

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Engine check light- code 455- computer stated large emission leak- my mechanic has to do a smoke check. could be charcoal filter for gas tank. I plan on taking car in next week and would like have a idea of what cost I am facing.

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  • jrwalters2 Aug 28, 2010

    Thanks for the info. Gas cap was previously replaced no help. but this gives me enough info to understand what going on.
    How do I let you know what the final fix is?

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  • 105 Answers

  • Po455 refers to a gross (large) leak in the emission's recovery system
  • Is the gas cap tight?
  • Check to see if the fuel cap is factory
  • aftermarket locking gas caps can cause this code
  • If cap is original Check Sealing o-ring on cap
  • if the o-ring is damaged replace cap
  • if the o-ring appears to be flattened carefully remove it and turn it over/ reinstall
  • has the car been in a collision?
  • if so inspect charcoal canister for damage> replace if necessary
  • Under the hood on a sticker there should be a vacuum routing diagram.
  • locate the charcoal can on the sticker and trace down connecting vacuum lines.
  • Look for damaged hoses replace as required
  • The canister can be as much as $200 for parts alone
  • replace the gas cap first
  • disconnect the battery for 5 minutes to clear the code
  • operate car through 2 drive cycles.
  • drive cycle> from cold engine to operating temp for 10 minutes at various speeds
  • let it cool and repeat drive cycle
  • if Check engine lamp remains off Problem is
  • FIXED
  • if not possibles are
  • damaged charcoal can
  • unseen collision damage
  • inoperative vent solenoid valve (electrical solenoid that closes when demanded by computer to seal the fuel vapors in the system
  • Hope this Helps you understand the system
  • If you have questions please let me know
  • Hope your Fixya Experience was positive
  • Please rate this solution
  • Thanyou

Posted on Aug 28, 2010

  • james bierman Aug 28, 2010

    to contact me log back in to fixya

    search experts for "FREELABOR"

    you should be able to send a followup

    Glad I could help

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What should I check with code 0455 for 99 Ford Ranger


The Evaporative emission system has a large leak allowing fuel vapors to escape to the atmosphere . There are hoses an a purge solenoid ,a vent solenoid ,charcoal canister to store fuel vapors in . The charcoal canister is located under the vehicle near the fuel tank an has vapor lines running to the front of the vehicle to where the engine draws in the vapors by the engine computer opening the purge solenoid ! Any of this vapor hose could have a hole (leak) ,the gas cap could be lose or bad . The fuel filler neck could be rusted through ! At the repair shop we hook up a smoke machine to the system an look for a leak like that ! easy !

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What does this code mean p0455


Code 455 is a problem with the EVAP system - a large leak was detected.
The computer vents the gas tank to the vapor canister when the engine is running. It pressure tests the gas tank before and after venting.
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The most obvious cause for this would be a loose gas cap. If the cap is tight then you can carefully inspect all of the evap hoses for cracks. It is very common for these to crack and leak on all chrysler products.

If you don't see anything obvious than your next step is to have the evap system smoke checked for leaks. The smoke will be introduced into the evap system under slight pressure. Wherever the smoke comes out is the source of the leak.

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Where is the EVAP emission control system


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Does the vehicle have a P code for some EVAP problem, like large or small leak, or vent path blocked? Do you have a problem filling the fuel tank or is the Check Engine/ MIL lamp illuminated? If there is a larg or small leak the best way to identify where the leak is located is to use a smoke machine which creates smoke and introduces it into the system and you look for the leak.You will need to close the evaproative diagnostic solenoid using a scan tool or a jumper harness.

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2000 cavalier check engine light code po440


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evaporative emission (EVAP) system has a large leak.
Check the gas cap or vent valve. these are the most common problems.


The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the Fuel tank pressure sensor (FTP). When the sensor indicates a small leak in the EVAP system, this code is set.


Here are some additional causes.

* A small leak in any of the EVAP hoses or fuel tank hoses
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the other causes are leaking evaporative emission plumbing from the fuel tank to the engine compartment, someone changed the fuel pump and did not seal it properly,
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The only way to diagnost these is an OBDII scan tool and a smoke machine the light will come on when the computer does its test of the system and there is a hole as small as .020"
1/20,000 of an inch !
The light can only be turned off by a OBDII scan tool

if you found this information helpful please give me a good rating

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If you need any additional help on this please contact me

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