I used search criteria to google: "2017 impala code c0800-03"
Following is a DIY explanation. Usually there are little reasons that have nothing to do with a Module so it's likely to be an inexpensive fix.
Read as much of the link below as you can. Then do a couple searches on your own using the same criteria as above. You'll then have a good idea of what you are observing versus what the search results talk about.
How can you resolve the fault code C0800 03 Control Module Power Circuit Low Voltage? Will your Chevy need to be taken to a mechanic for this?
cararac.com
(PDF Attached in case link disappears over time)