NHTSA complaint #11730452

Owner complaint summary

The vehicle's Telematics Control Box (TCB), located beneath the roof-mounted shark fin antenna, failed due to water intrusion and internal corrosion. The failure produced the following fault codes confirmed by BMW of Norwood, MA: B7F341 (backup battery hardware defective), B7F33C (internal ECU error), and B7F327 (microphone short circuit to ground), along with cascading faults across multiple other vehicle modules. Symptoms included a persistent 'Emergency Call System Malfunction' warning on the instrument cluster, loss of GPS/navigation accuracy, and loss of odometer display. The shark fin antenna base seal — a foam tape and adhesive system — had likely deteriorated after approximately 6-7 years of service, consistent with a pattern of failures reported by numerous other owners of 2017-2023 BMW X1, X3, X4, X5, X6, X7, M440i, M550i, 330, 340i, and 750i vehicles. BMW dealer quoted $3,300 for repair. An independent BMW specialist quoted $3,500. BMW North America declined to cover the repair as the vehicle is out of warranty, despite acknowledging the issue as known. This failure mode is the subject of active class action litigation (Craft v. BMW of North America LLC, Case No. 1:24-cv-06826, U.S. District Court for the District of New Jersey) and an ongoing investigation by Sauder Schelkopf LLC on behalf of affected owners. SAFETY CONCERN: The failure disables the Intelligent Emergency Call system, which automatically contacts emergency services in the event of a serious accident. Additionally, the persistent warning obscures the instrument cluster including the odometer display, impairing normal vehicle operation. Water intrusion reaching vehicle electronics represents a broader safety risk if it propagates to safety-critical modules. ACTION REQUESTED: Formal investigation into the adequacy of the shark fin antenna sealing design across affected model years, and consideration of a recall or extended warranty to cover TCB replacement costs for affected owners.