Question about 2002 Chevrolet TrailBlazer

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Check engine Light

My check engine light keeps coming on with the same code. P0455 is the code. Had dealer replace several items including the gas cap & a check valve that the dealer assurted me would fix the problem. Any suggestions?

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  • ntfd67 Feb 21, 2009

    Thanks. When I get a nice day I will attempt.

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The P0455 indicates you have a gross vacuum leak in the EVAP system.
Start at the engine and the vacuum purge valve, start checking the vacuum hoses and lines all the way back to the EVAP canister near the gas tank. Make sure no hose or lines are cracked / disconnected.
If all looks OK, let me know and we will proceed from there. Below is a schematic of the EVAP system for reference.
Good luck and let me know.
Regards,
Check engine Light - 14ebebd.jpg

Posted on Feb 21, 2009

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