P0621 on the 2004 Chevrolet Malibu
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.
| 01649 | 2004-06-29. Service bulletin. THE CONDITION IA A SHORT FLASH OF THE BATTERY LIGHT AND DIAGNOSTICS TROUBLE CODE (DTC) P0621 AS A HISTORY CODE. *MJ |
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| 01649 | 2004-06-03. Service bulletin. 3.5L LX9 ENGINE DIAGNOSTIC TROUBLE CODE P0621.*MR |
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.