P0503 on the 1997 Ford Expedition
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.
| 983170 | 1999-09-22. Service bulletin. CONCERNS WITH CODES P0500, P0503, P1501 OR P1503 WHICH MAY BE CAUSED MY A LOOSE SPEEDOMETER DRIVE GEAR. *TT |
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| 9858 | 1998-07-20. Service bulletin. THE MALFUNCTION INDICATOR LAMP (MIL) MAY ILLUMINATE AND DIAGNOSTIC TROUBLE CODE (DTC) P0503 MAY BE STORED IN MEMORY. *YC |
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.