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Message: <blockquote data-quote="leforte" data-source="post: 284108" data-attributes="member: 1943">check your alternator voltage regulator. if its damaged/fused, the voltage will spike/dip, a small matter will just caused the battery to overcharged or not charged at all, your battery will act as a "?heatsink" to absorb all the excess current until it can take no more. there after it would fry the vital components like the DME (ecu) and EGS ( transmision ECU). a factory programed fail safe system   will revert to limp mode to preserve the components but sometime it maybe too late, hopefully your dme and egs isnt badly shorted/damage beyond it fail safe point. FYI Do remember after your repair that your cold air ductting to your alternator is properly attached and not stuck with leaves, heat is the primary cause of alternator failure.</blockquote>