Serious safety issue with 2004 BMW 330

Asked by May 11, 2017 at 07:15 PM about the 2004 BMW 3 Series 330i

Question type: Maintenance & Repair

My 2004 BMW 330 will suddenly lose power (all red lights flicker then come on; vehicle loses power, suddenly jolts to a near halt for about 2 - 5 seconds, then picks up again).  Brake light and yellow warning light stays on, but disappears after I turn off engine and restart.  Happens sporadically and unpredictably.  My mechanic has already replaced the harness and the DME (at great expense) but problem still persists.  Has anyone seen this before?   

3 Answers

257,385

I would check the battery cables, alternator cables and all grounds on the car for corrosion and being loose. What is the voltage on the battery? Alternator fine?

1 of 1 people found this helpful.

Mechanic says all that checked out. Not sure what to do next.

257,385

Try another mechanic preferably a BMW independent shop.

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