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Discussion Starter · #1 · (Edited)
Friends truck is '13 6sp. Tuner. 150k. Been great truck but mechanics are stumped now. 1st pass. battery failure. Batt replaced, fine for a week. Now it run like crap on tune but runs fine on stock tune. Still doesnt seem right on stock but running decent. Runs few hundred miles and limp mode/see dealer light activates. Re-load stock tune n its fine again for a bit. Load a hotter tune n smoke miss total garbage. Codes not showing issue. Tuner tech tried to help but says it sumthing else. Maybe ECM is fried? Why would ecm accept a stock program but not another? I have read of diodes and alternator issues so I wonder if related? Its a darn good diesel Mech stumped on this which doesnt happen to him often. Any Ideas? Hate for friend to throw $ parts hoping it fixes it.... Thanks.

Also, how do you change your signature on profile? I cant figure it out either...
 

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Click the last link in my Sig, it will take you to the page.
 
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