My 12v battery was dying so I had it replaced. After the new battery was installed, I got the Limited Power Mode error and it won't go away. How do I fix this?

Hi all, I just bought a used 2012 Fiat 500 and now it doesn't turn on :( I took it to the shop and they said they would need to replace the Body Control Module (BCM) to even diagnose the problem. Fiat shop will charge me $1275 to replace the BCM. From your experience is this worth it to figure...

I take my fiat 2015 Fiat 500e (19k miles) On the same route every day, and i noticed the motor power has been going very high (i monitor the power always while driving) it is just taking a lot of motor power to go up the smallest of hills. Any guesses why? Any responses help.