This is a weird one. MPVI2 is about 3years old, has been working great since day one on my 2019 Mustang GT. Been tuned several times, no issues with reading/writing.
Today doing some logging on my way to a baseball game about 20miles from home. Car driving great and the last mile the entire dash lights up (traction control light, Stabil Trak, traction control, orange wrench light, drive modes unavailable), then the speedometer and tach go to zero and stay there. All power in the car then dies out like the key was put to off, but the car itself is still running and driving. I can shift gears fine, it idles fine. Got about half a mile up the road to a pull off and pulled over. Decide to turn off the car and see what happens. Well, car no longer starts, all interior lights are dead, nothing works like its shorted out somewhere. I pop the hood, disconnect the battery for a few minutes. Try again, no change.
I decided to unplug the MPVI2 from the OBD port and hit the start button. Car starts fine, all lights working. I connect my laptop and forscan to clear codes.
It has way too many codes to list from every module in the car. I clear the codes; things are back to normal. I drive it back home with the MPVI2 sitting on the passenger seat. Car drives fine, zero issues. I get home, while idling in the driveway I plugged in the MPVI2 again, and instantly the same thing happened. All the dash lights come on, wrench light back on, no traction control, no drive modes, no stabilitrak. This time the radio and interior lights stayed on, although I didn't drive it or leave it idling long to see what happened. Once it made the dash a Christmas tree I decided to shut it off. Tried to start it again, no start with the MPVI2 plugged into OBD port. I pull MPVI2 out, car starts right up. I connect laptop again, and ran forscan, cleared the codes. Disconnected laptop and drove it around 10-12miles. Zero issues.
Came home and updated firmware on MPVI2 (no current updates). I am at a lost here. Has anyone experienced this or seen something similar? I have never had any electrical issues with the car, and were the car runs fine with the MPVI2 unplugged, makes me believe something internally with the MPVI2 has gone bad.
I can still connect the MPVI2 to laptop via USB C cable and update/resync it with zero issues. Once I plug it into the OBD in the mustang, that's when the car has a meltdown.
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