P25B4 on the 2021 Porsche Cayenne
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.
| No. 250-22 | 2023-01-10. Service bulletin. Technical information for a check engine warning light is active in conjunction with fault memory entry “P25B400” in the DME control unit |
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| No. 2230 | 2022-10-05. Service bulletin. Instructions on advanced technical information - DME Fault P25B400 (008403) “Wastegate, turbocharger bank 1 – stuck closed |
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.