Possible causes

– Input Clutch Solenoid Valve is harness is open or shorted
– Input Clutch Solenoid Valve circuit poor electrical connection
– Faulty Input clutch solenoid valve

Tech notes

There is a service bulletin for a various Nissan Models with the RE5R05A transmission.
Factory Nissan Service Bulletin OBDII Code P1754

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1754 NISSAN Description

Input clutch solenoid valve is controlled by the Transmission Control Module (TCM) in response to signals sent from the Park and Neutral (PNP) switch, vehicle speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be shifted to the optimum position. This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical malfunction such as control valve sticking, improper solenoid valve operation.