2006 Mustang question

[CEHollier]

I understand this is 2015 and above Mustangs. I was hoping someone here could answer my question. My nephew tuned his 2006 V6 Mustang. He is having transmission issues and cant find the tuner. Is the factory tune necessary to get codes ? Thanks for a car that old?

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[Shifting_Gears]

Codes should be able to be pulled regardless. Most major parts stores will do a scan and code read for free.