Consistently breaking differential bolt that hold the rear differential in place, very widespread issue as well as being consistently noted in forums. Also a high number of differential completely failing across all years. Mine failed recently, two other vehicles at the same dealership had a broken differential. There needs to be a recall on both of these issues.
2020 BMW X3 transmission complaints
Page 2 of 2: complaints 11 to 14 of 14, newest first, as owners wrote them.
The issue is with the rear differential carrier bolt, Part # 33176760336. This bolt shears at the hex head and causes the differential assembly to misalign with the rest of the driveline components and causes further failures of the driveshaft and other items. Just in the past month I have seen several people post on the BMW X3M facebook groups and also on Internet forums about their broken bolt causing issues. The OEM bolt is a 10.9 grade bolt that does not appear to be able to take the stress put on it for daily driving. My car is exhibiting symptoms that others have heard in their cars before the failure occurred, Clunking when putting the car into drive or reverse. This can also be heard while going into second gear and driving at 5-20mph on light throttle then letting off the gas pedal and getting back on, this will cause the differential to clunk back onto the bolt and off. This is a failure due to a simple bolt component that could be enhanced by BMW to a higher tensile strength to avoid this situation from happening on the highway.
The contact owns a 2020 BMW X3. The contact stated while accelerating from a stop, there was a loud, popping sound coming from the vehicle. There was no warning light illuminated. The contact inspected the vehicle and discovered that the upper rear differential mounting bolt head had sheared off. The contact took the vehicle to the dealer and the failure was confirmed. The vehicle was repaired under warranty. The manufacturer was not notified of the failure. The failure mileage was approximately 36,000.
Vehicle engine RPM will arbitrarily increase from 500-600 RPM to 1200-1500 RPM while idling in drive and at operating temperature, such as at a stoplight or in a drive-through. The vehicle also makes a distinct clunking sound under normal stop-and-go driving conditions.
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