DTC P1404: EGR Closed Position Performance: Description

The PCM monitors the EGR valve pintle position input to ensure that valve responds properly to commands from PCM. When ignition switch is turned on, PCM learns the EGR learned minimum position. PCM compares 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.