P0621 on the 2003 Saturn Ion
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.
| 030603010 | 2004-03-04. Service bulletin. SERVICE MANUAL UPDATE REGARDING TROUBLESHOOTING TABLE FOR DIAGNOSTIC TROUBLE CODE (DTC) P0621. *TT |
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| 060303010 | 2004-02-19. Service bulletin. SERVICE MANUAL UPDATE REGARDING TROUBLESHOOTING TABLE FOR DIAGNOSTIC TROUBLE CODE (DTC) P0621. *PH |
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.