I think what may be happening is the same thing that happened to me. It's not hearing, per se, which is the problem.
Under one of the more recent updates, the game perceives it as an error in the character if ALL stats are 18 or above, and you get that character checksum error message in red. This can be avoided by keeping at least one of your attributes below 18 in character editing.
So, for example, if you had everything at 20, you'd get the error, but if you then reduced hearing to 17 it would seem to solve the problem. But the reality is reducing ANY of your attributes to 17 would solve the problem.
Please let me know if this checks out for your character (try editing hearing to above 17, but reducing a different attribute to 17). If I'm wrong, please let me know.
If I'm right, it's not a problem that can be solved by cheat engine; there's just a hard-coded check that checks to see if your attributes are all 18 or above and spits out an error message if so. The work-around is to keep at least one attribute at 17 or below.