P0420 on the 2014 Buick Encore
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.
| 19NA057 | 2020-04-06. Service bulletin. This Technical bulletin provides a procedure for dealers/technicians to correct a condition of Malfunction Indicator Lamp (MIL) Illuminated, DTC P0420 Set. |
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| 19NA057 | 2019-04-22. Service bulletin. This Technical bulletin provides a procedure for dealers/technicians to correct a condition of Malfunction Indicator Lamp (MIL) Illuminated, DTC P0420 Set. |
| 18NA331 | 2019-03-25. Service bulletin. This bulletin provides a procedure to reprogram the ECM to correct a condition of MIL On, DTC P0420 Set. |
3 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.