I thought this may help someone in the future as it helped me.
https://www.youcanic.com/mercedes-benz-p1c0300-fault-code-malfunction/
https://youtu.be/KskiQcvHDFA
Looks like the YOUCANIC scanner can access all systems on the B Class electric.
https://youtu.be/KskiQcvHDFA
I contacted the company and they confirmed that this work on the B Class electric. https://www.youcanic.com/scanner
Looks like the first step is to read the fault codes. I just found out that the YOUCANIC scanner can read the codes on the B Class.
https://youtu.be/KskiQcvHDFA
They also have this article on the issue:
https://www.youcanic.com/mercedes-benz-p1c0300-fault-code-malfunction/