We put a fax kit in a mpc 2500 and now we have a sc202 code. We checked voltage to the polygon. It is there. Our harness is good but the controller has been replaced due to a lightning hit. I know that we are beating a dead horse but we are trying to save it. Any ideas would be appreciated.
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I hope this will do:
SC202 and SC203 self-diagnostic error occurs
Question A write-related self-diagnostic error occurs: SC202, SC203. Answer [Cause]
When installing the FAX unit, the harness that connects the BiCU's CN520 was caught between the FAX unit and the BKT:MB.
[Resolution]
Reattach the FAX unit and replace the damaged harness
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