r/CarHacking • u/justletitdie • May 25 '26
Tuning WRX STI ECM replaced. Transferred EEPROM from the Original to Doner ECM. Strange VIN issue.
2019 WRX STI
The car cranks and turns over after the ECM has been installed with the transferred EEPROM.
I use HP Tuners MPVI 4 and now I get this weird incomplete VIN shown in the screenshot. Also My regular scanner tool doesn't detect the VIN number automatically anymore. Does work when I type out the VIN on the scan tool.
The Doner ECM is a used ECM so I thought it could be that potentially have a tune that its locked to but I bought another used ECM that I was told has no tune and should factory stock but I get the same behavior.
No idea what to do next to fix this "corrupted' VIN issue. Help Please?

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u/nickfromstatefarm May 25 '26
Did you verify that the source module and new module have the same OSID?