Hi, these comments have been very useful.
I have the same problem caused by liquid damage. I run the laptop without battery and the apple hardware test get the same error.
The battery conector have sulfate but the logic board looks clean. The laptop performance improve significatly without the battery. The solution is replace the battery for a new one? Why the apple harware test get me the same error even the battery is disconected?
Have you found the solution?
Thanks a lot!