BMW M850i Complaints

2 consumer complaints on file.

• #11673452July 14, 2025
  POWER TRAIN

  Fuel pump failed within a minute of initial warning and performance indicating a problem. While driving ~60 mph on the highway, available power dropped to zero within a couple tenths of a mile, *barely* allowing me to move to the shoulder. Screen error/fault indicated vehicle was ok to keep driving but to schedule service soon. Car restarted an ran for another tenth or two of a mile so I was able to move out of the dangerous shoulder off-ramp location to a slightly better shoulder location. Dealership diagnosed a failed fuel pump (10-20 psi of available pressure vs 60+ normally). They replaced it and a control module to address the problem. No parts were retained by me. Until that trip I experienced no signs of a fuel pump or power delivery issue. Vehicle had ~46k miles on it and was operating normally until that point.

  Crash:

  No

  Fire:

  No

  Injuries:

  0

  Deaths:

  0

• #11650100March 24, 2025
  ENGINE AND ENGINE COOLING

  The contact owns a 2019 BMW M850I. The contact stated that upon starting the vehicle, there was an abnormal coolant odor inside the cabin of the vehicle. There was no warning light illuminated. The vehicle was taken to a local dealer to be diagnosed, and the contact was informed that the expansion tank was faulty and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 60,128.

  Crash:

  No

  Fire:

  No

  Injuries:

  0

  Deaths:

  0