U0300 on the 2004 Ford Thunderbird
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.
| 17666 | 2004-06-22. Service bulletin. DIAGNOSTIC TROUBLE CODE (DTC) U0300 (INTERNAL CONTROL MODULE SOFTWARE INCOMPATIBILITY) STORED IN THE PCM WITH NO OTHER DTC'S PRESENT. *TT |
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1 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.