DTC P1404: EGR Valve Closed Position Performance: Description

PCM monitors the Exhaust Gas Recirculation (EGR) valve pintle position input in order to ensure that valve responds properly to commands from PCM. When ignition is on, PCM learns the EGR learned minimum position. PCM compares the EGR learned minimum position to EGR position sensor when EGR valve is commanded closed. If EGR position sensor indicates that EGR valve is still open when PCM is commanding EGR valve closed, DTC will set.