12662677 SN.

For 2016, SPS appears to prevent ECM-only programming. When I tried, SPS tried to locate the TCM, apparently they have to be programmed in the same operation. Has anyone run into this dead end? What was your work-around?

Some ding dong told me also, that a used 2016 ecm could not be programmed to another trucks VIN. I am guessing this was just another dealer tech 2 limitation?

Hopefully there are some folks here who have overcome the new protocol. ACDelco has turned into fort knox. A password change every 2 months is pretty ridiculous.