P0420 on the 2025 Cadillac XT4
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.
| PIP6067 | 2025-05-29. Service bulletin. This Preliminary information communicates to the technician to replace the catalytic converter, pre and post oxygens sensor as an assembly. Engineering is collecting parts to determine the cause of the P0420. |
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1 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.