Why will the SVl-KHCFGE00 smart card not start the car.

The smart card key also has a battery - as you know - which could indeed be weak. I would attempt replacement of this battery first before jumping to further conclusions. As a note, if there is a low battery for the engine, it won't allow starting either. It's all guesswork until you verify proper operation of components. Certainly, the key would have to be functional and programmed at when provided with the vehicle and would be assumed to be so. I cannot see or think of any additional concerns you are missing. 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.