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What 23 owners told NHTSA about the 2017 BMW 4 Series Gran

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (23)Crash / fire / injury (1)Engine (9)Electrical system (4)Airbags (3)Engine & cooling (3)Seat belts (2)Transmission & drivetrain (2)Body & structure (1)Fuel system (1)Seats (1)Tires (1)

1 of 23 complaints match · Body & structure · clear filters

Mar 23, 2020Body & structure

MY WIFE WAS DRIVING OUR 2017 BMW 430I WITH OUR INFANT SON IN THE BACK SEAT. SHE TRAVELING APPROXIMATELY 70 MPH ON THE FREEWAY WHEN SHE HEARD AN EXPLOSIVE SOUND WHICH RESULTED IN THE GLASS SUNROOF TO SHATTER. THE SUNROOF WAS NOT OPEN, THE HEAT WAS NOT ON, AND THERE WERE NO VEHICLES IN FRONT/BEHIND, OR NEXT TO HER. NO VISIBLE EVIDENCE OF ANY ROAD DEBRIS. IT JUST EXPLODED OUTWARD, AND NO CLUE AS TO WHY.

NHTSA ODI 11319018

Working with the data? Download all 23 complaints as CSV · fetched from NHTSA July 20, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2017 BMW 4 Series Gran verdict →