DTC Description: Notes
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
The Engine Control Module (ECM) receives battery voltage through the battery supply circuit. The ECM receives ignition voltage through the ignition supply circuit when the ignition switch is in the ON or START position.
At ignition OFF, the ECM remains powered for a short period of time. During this period of time, the ECM saves important data to memory. If the ECM battery and ignition circuitry are malfunctioning, maintenance and DTC data could be corrupted or inaccurate.