I start my 2019 Nissan Pathfinder and it shuts off immediately.

Hello, Dave here, contributing to RepairPal and providing expert advice since 2010. If the vehicle starts and stops, it's not a bad idea to check the battery integrity and state of charge. However, I would suggest that it is more likely that there is a concern with engine performance - fuel supply, air intake -- too much or not enough air coming in. See where your efforts go, and if needed - enlist the assistance of a technician at a shop near you. Here are links to find one -- https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.