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Hey guys, new to this, was told by a customer today that GM 6L have a unlock code? Sounds like a second factory tune built into the pcm, has anybody heard of this if so how do you flip the switch? Was told this feature is used by the highway patrol for added power.
Don't believe everything you are told. Especially that one.
Thanks for taking the time to reply. Sounded like bulls#@t to me,the sad thing is the guy is a member of this forum. Its too bad some try to look better by giving bad info to others.
not a second factory tune, but I have done alot of second tunes per say by using the tow/haul button. Basically putting very aggressive shift patterns in tow haul mode to give the feel of a second tune. I have heard quite a few tuners tell me that they tell customers that this is a second tune they install. I usually laugh at them. I don't understand being deceitful. Just tell the customer what you are doing! Because eventually somebody else's hands are sure to be on the file, and then be prepared to be dragged through the dirt