Ok code 12 means that you disconect battery recently, maybe you were trying to clear trouble code by doing that, in worst case just replace the battery not a big deal
Code 55 means "no Trouble codes found" code 55 means that thats the end of self testing codes, there is no mode code. just ignore code 55.
im pretty sure you were doing a selft testing dtc bye turning switch on and off.
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