P0401 on the 2003 Honda Pilot
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.
| 05-026 | 2008-04-24. Service bulletin. HONDA SERVICE CAMPAIGN: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. WARRANTY EXTENSION: EGR VALVE CONTAMINATION OR EGR PORT CLOGGING MAY CAUSE DTC P0401, DTC P1491, OR ENGINE HESITATION/SURGE. CSC WAS RECEIVED. *NJ |
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| 00009 | 2005-11-08. Service bulletin. WARRANTY EXTENSION: EGR VALVE CONTAMINATION OR EGR POR CLOGGING MAY CAUSE DTC P0401, DTC P1491, OR ENGINE HESITATION/SURGE. *TT |
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.