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DTC P1610: Lock Mode: Description

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

When the starting operation is carried more than five times consecutively under the following conditions, NATS will shift to the mode which prevents the engine from being started.

Unregistered mechanical key is used.
BCM or ECM's malfunctioning.