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P0455

P0455 is the code GM calls “Evaporative Emission System Large Leak Detected.” GM bulletin 21-NA-124 says the vehicle sets it for a large leak or a purge blockage. The customer complaint it lists is a lit malfunction indicator lamp (MIL), the check engine light.

1 guide · GM bulletin references

EVAP large leak

GM bulletin guides

1 relevant guide

  1. Chevy P0455: GM’s Large EVAP Leak Checks (2000–2021 Gas)

    P0455 on a 2000–2021 GM gas vehicle: the four causes in GM bulletin 21-NA-124, the order they are checked, and two truck and SUV bulletins.