Gently try to move the shutters by hand (with the car off) to see if they are physically bound.
While the code points to "Range/Performance," the root causes vary in severity: nissan p155b-00
Do not touch orange high-voltage cables without proper training and safety equipment. The hybrid system operates at dangerously high voltages. Potential Fixes for Nissan P155B-00 Gently try to move the shutters by hand
In some Nissan service bulletins, merely replacing the sensor isn't enough. The PCM may need a software update to prevent the code from returning, specifically on 2013-2015 Altima models. specifically on 2013-2015 Altima models.