Had same issue, start with alternator voltage regulator...I had a similar issue on my e90 320d. All lights on the dash came on. rev counter went wonky. Speedo would jump to 0 and then to my current speed. Gearbox would randomly go into limp mode etc. ABS DTC BRAKE lights were all on. If i switched the car off and on all the lights went off and i could drive again for a while. It seemed like it only happened when the car got hot.
I read that it could be a battery issue so i went ahead and changed the battery even though my existing battery tested fine.
Then i called Gert who said he can fix it, but the problem is that hes on the other side of the world. So i decided to try 1 more thing before packing some padkos and heading to Gert.
I ran a diagnostics using INPA and the car complained about IBS module error but my car doesnt have an IBS module. Then under the suspension menu, one of the modules complained about voltage > 18v. But i tested charging circuit and it was fine. So i decided to change the regulator...
Original Valeo regulator was R1300 from diesel electric but no stock so i had to settle for a pirate part from a auto electrician at R650. I put it in and problem was gone for good. So to make a long story short.....
A REGULATOR IS CAPABLE OF RANDOMLY THROWING OUT VOLTAGE SPIKES.
I always believed a regulator was either working or not but i got schooled. Hope this post helps others.
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