P0440 on the 2004 Buick Regal
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.
| 11052003 | 2005-04-08. Service bulletin. DIAGNOSTIC TROUBLE CODES P0440 AND P0455, ALONG WITH A LOOSE FUEL CAP MESSAGE DISPLAYED ON THE DIC ON VEHICLES WITH 3800 ENGINE APPLICATIONS. *TT |
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| 01505 | 2004-03-01. Service bulletin. LOOSE FUEL CAP MESSAGE AND DIAGNOSTIC TROUBLE CODE (DTC) P0440, P0455. *TT *MJ |
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.