2004 Chevy Trailblazer Service Engine Light is on and has a P0455 code?

I change the gas cap but the Engine Light is still on saying P0455 was else can be the problem for clearing this code ?

3 Answers

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  • Anonymous
    2 years ago

    Did you clear the codes after changing the gas cap? If you did not, go to a car parts store and have them clear the codes. If the CEL comes back with the same code, you will need to see a mechanic with a scanner and a smoke machine to check for a leak in the EVAP system.

  • 2 years ago

    Large evap leak. Could be anything from a cracked hose to a stuck open vent valve or purge valve.

  • Scott
    Lv 7
    2 years ago

    It takes some time for the light to turn off if that did fix your problem. It takes x number of start/stop cycles for the system to reset. Or, go buy your own OBD2 scanner and clear it yourself.

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