# P0400 on the 1996 Buick Roadmaster

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.

## Bulletins for this model year that name P0400

- [616774](https://open.wenmarpro.com/bulletins/616774), 2001-03-09: 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