P0420 on the 2024 Buick Envision
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
Nobody has written a description of this code yet.
| 25-NA-005 | 2025-02-11. Service bulletin. This service bulletin provides information for dealers/technicians on DTC P0420 Setting. |
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| 25-NA-005 | 2025-01-28. Service bulletin. This service bulletin provides information for dealers/technicians on DTC P0420 Setting. |
2 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.