DTC P1404: EGR Closed Position Performance: Description

Powertrain Control Module (PCM) monitors Exhaust Gas Recirculation (EGR) valve pintle position input to ensure valve responds properly to commands from PCM. When ignition is turned on, PCM learns EGR learned minimum position. PCM compares EGR learned minimum position to EGR position sensor when EGR valve is commanded closed. DTC sets when EGR position sensor indicates EGR valve is still open when PCM is commanding EGR valve closed.