Hi,
Unfortunately, this all to commonly causes modules to fail and sensors to fail. There is no way I can tell you for sure what is causing the vehicle to not start because when you reverse the polarity of the electrical system it damages the sensitive components such as the PCM.
What I would suggest is to have the vehicle scanned with a scan tool and see if you are able to communicate with the PCM and other modules. If not, they are most likely damaged and will require replacement.
This type of issue is similar to the vehicle being struck by lightening. You may want to contact your insurance company and tell them what happened because most cover this type of incident because it happens more than you would think.
Let me know if you have questions and we can go from there. Thanks
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Wednesday, September 4th, 2019 AT 4:21 PM