No. It is standard practice for 3rd party equipment to plug into a vehicle’s diagnostics port. In the US, the Moss Magnuson Warranty Act of 1975 specifically prohibits manufacturers from voiding the warranty due to aftermarket additions to the vehicle. In addition, Samsara is specifically designed to not interfere with a vehicle’s operation. Samsara is read-only and does not attempt to modify a vehicle’s ECU.
Samsara is a member of ETI, an organization that includes both diagnostics vendors and vehicle manufacturers, providing Samsara with diagnostics information directly from manufacturers. And Samsara is thoroughly tested for interoperability with a wide variety of vehicles.