My 2018 Fiat 124 Spider sat for over a month, what reasons for it not starting?

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your vehicle. Since your Fiat 124 Spider sat for over a month, the battery is the most likely culprit, as batteries can discharge after sitting for an extended period of time. Since powering the starter to turn the engine requires much more power than the interior lighting, I would not rule it out. Another common cause would be damage to wiring, especially if the vehicle is easily accessed by wildlife. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!