We have a L86 6.2 10L90 installed in an older vehicle. We are running a 2017 E92 ECU and a T93 (unlocked) for the 10L90.
We have ran others with a 2017 ECU and T87a 10 speed but for some reason this transmission was newer and would not function with a T87a. We installed the T93 that it came with and it works perfect, TAP shift, TOW/HAUL ETC... except for a code for the aux fluid pump, so we sent it to HPT to be unlocked and were going to turn that code off because we are not using the stop/start function or the aux fluid pump.
We were able to read the T93 (HPT supplied stock file) and make changes to the tune but when we try to flash it in, it errors out with a negative response code x7F. It even allowed us to license the TCM.
Going thru HPT support and it seems that they are saying it will not write to it because their database says that the T93 should be in a newer vehicle with a newer 2019 ECU and ours has a 2017 ECU and VIN
Has anyone been able to get HPT to add a VIN to the database to allow a write to function?
Or
Could the T93 TCM be read without a ECU attached and be tuned by itself?
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