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Went to the shop this morning and uninstalled MHD, drove it for about 20 minutes with voltage meter hooked up, including at least a dozen WOT pulls. This would have previously caused BSD codes, loss of comm with alternator (and therefore drop to 12V battery voltage) and limp mode without fail. Without MHD, no codes, no limp mode, no voltage drops.
It only took $500 worth of diagnostic time at two shops plus this forum to figure it out, lol. Even though my tech and I are 99% sure that the tune is the problem, I'm going to reinstall MHD later to see if the issues come back. Then uninstall again to prove that they go away. Then I will reach out to MHD.
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2011 E90 335i M-Sport, PPK, cp-e CP, Helix stepped FMIC, xHP stage 3, Wagner catted DP, MHD stage 2 E30, GFB DV
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