Code P1406, EGR Valve Pintle Position (1 Of 2): Notes

WARNING: This page is about a different car, the 1994 Oldsmobile Ninety-Eight and 1994 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.

PCM constantly monitors the linear EGR valve pintle position sensor to ensure the valve is responding properly to commands from PCM. Code P1406 will set when the following conditions are present.

EGR pintle position signal indicates a voltage out of normal range of pintle position sensor, or a signal that is 10 percent greater or less than PCM commanded position.
Either condition for up to 20 seconds.

PCM will illuminate Malfunction Indicator Light (MIL) if Code P1406 sets during 2 consecutive key cycles.

NOTE: Test numbers refer to numbers on diagnostic chart.

Checks for an EGR valve sticking partially open or an incorrect pintle position sensor feedback signal.
Ensures PCM is capable of controlling EGR pintle position and is reading pintle position feedback signal Properly.