P0400 on the 1996 Cadillac Fleetwood
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.
| 00096 | 2001-03-09. Service bulletin. SOME CUSTOMERS MAY EXPERIENCE A FAILURE OF THE EXHAUST GAS RECIRCULATION (EGR) VALVE DUE TO CORROSION OF THE INTERNAL DIAPHRAGM PLATE, LEADING TO DRIVEABILITY COMPLAINTS OF A CHECK ENGINE LIGHT FOR EGR VALVE (DTC P0400); OR ENGINE STALL AT IDLE, RUNS ROUGH OR SURGES. *TT |
|---|---|
| 776509 | 1997-08-21. Service bulletin. DTC P0400 SET (INSTALL FLASH CALIBRATION). *TW |
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.