DTC P0217: Coolant OVERTEMPERATURE Enrichment Protection: Description
WARNING: This page is about a different car, the 2002 Nissan Xterra and 2002 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
This diagnosis checks whether the engine coolant temperature is too high, even when engine load is not heavy. When malfunction is detected, MIL will light up on the 1st trip.