Possible Cause
WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0603
- Harness or connectors
[ECM power supply circuit is open or shorted.]
- ECM
DTC P062F
- Harness or connectors
[ECM power supply circuit is open or shorted.]
- ECM