P0503 on the 2003 Cadillac Deville
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.
| 11272002 | 2004-08-10. Service bulletin. AUTO TRANSMISSION DIAGNOSTIC TROUBLE CODE P0503, VEHICLE SPEED SENSOR CIRCUIT INTERMITTENT. *TT |
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| 011403 | 2004-01-30. Service bulletin. DIAGNOSTIC TROUBLE CODE P0503, VEHICLE SPEED SENSOR CIRCUIT INTERMITTENT. CUSTOMER MAY DESCRIBE THE CONDITION AS THE SPEEDOMETER INTERMITTENTLY GOES TO ZERO, THE VEHICLE MAY JERK AT TIMES, THEY ARE UNABLE TO SET THE CRUISE, THE CRUISE MAY INTERMITTENTLY DROPOUT. GM VOICEMAIL EXPRESS. *TT |
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.