Oh. That is odd. Your SoC shouldn't do that. The reverse is probably the same code. I think you said you lost the original code, so I guess that doesn't really help. Good luck finding it and let us know what the results are.

Actually, one thing you might want to try is disconnecting the negative battery terminal for a few minutes and then putting it back on. I know that this resets the onboard computer (or at least the diagnostic part). It cleared my check engine light. However, doing this will cause your mpg averages to be erased, and you will need to enter in your radio code (so be sure u have this before you disconnect it). I think it's worth a try.