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So I've been looking at getting a tuner of any sort preferably the Diablo Trinity. And I've been reading that you have to have an unlocked PCM for the 2015 s and 16s. I was just curious as to what would happen if you bought the tuner without the PCM. Would it just completely not work or could you just not do certain things with it? And I'm wondering about that for all tuners not just the Diablo, that's just the one I have heard of the most

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About the only thing I believe you would be able to do with a Trinity without an unlocked PCM is check for trouble codes.
 
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