Code P1406: EGR Valve Pintle Position: Notes

PCM constantly monitors linear EGR valve pintle position sensor to ensure 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.
  NOTE: Test numbers refer to numbers on diagnostic chart (1 Of 2).

1. Checks for an EGR valve sticking partially open or an incorrect pintle position sensor feedback signal.
2. Ensures PCM is capable of controlling EGR pintle position and is reading pintle position feedback signal properly.
3. Checks EGR valve driver in circuit and PCM.

Fig 1: Code P1406 Schematic (3.8L) EGR Valve Pintle Position

Fig 2: Code P1406 Diagnostic Flow Chart - 1 Of 2 (3.8L) EGR Valve Pintle Position