EVSE Charging cord blinks 5 times - Is there a resource to say what the fault is?

I have a 2012 Plug-in. Recently, the light won't come on next to the charging port when I plug in the cord. The cord's power light comes on for a few seconds, then turns off. Next it blinks 5 times, then powers down completely. I am guessing the 5 blinks is an indicator of something. Does anyone know if the meaning of the 5 blinks? I have seen threads where owners have gotten 3 blinks, but not 5. I am guessing that somewhere there is a datasheet or similar that tells the meaning of the blink code, but my google-fu is weak.

Does anyone know where the blink codes are described, or have suggestions for tracking it down? Taking it to the dealer is a non-preferred alternative. It is a long trip and just likely to end with them trying to sell me a new OEM cord at crazy prices. I can replace the cord, but I am particularly curious whether there is an under-voltage situation happening.