Nissan Repair Questions? Ask a Mechanic for Answers ASAP
You would initially need a full diagnostic code read to establish what code(s) are present. Once you have the codes a diagnostic path can be established.
Stop/Start systems will not work if there are any issues with the Engine Management System and or the Vehicle Battery. Is the battery you have fitted a genuine Nissan Battery. It must be the correct one or the ECM will notice an incorrect charging operation.
Even though the battery is a stop start battery it must still have the same rating as the genuine Nissan Battery.