P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance

Possible causes
  • Downstream hose is disconnected.
  • Downstream hose is plugged (ice).
  • Plugged or damaged EGR tube.
    • Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1406 Description
    While driving, the EGR monitor commands the EGR valve closed and checks the differential pressure across the EGR orifice. The test fails when the signal from the DPF EGR sensor continues to indicate EGR flow even after the EGR valve is commanded closed.
    P1406 Information for specific makes
    P1406 BUICK
    P1406 CADILLAC
    P1406 CHEVROLET
    P1406 DODGE
    P1406 FORD
    P1406 GMC
    P1406 PONTIAC
    P1406 SATURN