2020 BMW X3 Power Train Problems

The contact owns a 2020 BMW X3. The contact stated while driving 30 MPH, the message "Drivetrain Malfunction" was displayed. The vehicle was taken to the dealer where it was diagnosed that the heat management module needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure but offered no assistance and referred the contact to the NHTSA Hotline to report the failure. The approximate failure mileage was 29,400.

Mileage: 29,400

The differential mounting bolt will fail causing your differential to fall which breaks your driveshaft your transfer case and your exhaust system. This has been reported in well over 100 cars there is no warning light if driving at interstate speeds and this happens it could be catastrophic.

Was driving the vehicle home and while driving I heard a loud pop and a thump. Had the vehicle towed home to see that the real differential bolt had sheared off the head!

The contact owns a 2020 BMW X3. The contact stated while driving 10-15 MPH, he heard an abnormal noise from the rear differential bolt. The contact stated no warning light was illuminated. The contact took the vehicle to the local dealer and made them aware of the failure. The vehicle was not diagnosed or repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 35,000.

Mileage: 35,000

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.

Mileage: 36,000

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.

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.

The contact owns a 2020 BMW X3. The contact stated that while the accelerator pedal was depressed, the vehicle made an abnormal sound. The contact stated he self-inspected the vehicle and noticed a loosened blot in the rear differential. The vehicle was taken to the dealer, who informed the contact that the failure was a common failure with the year, make, and model. The vehicle was not repaired. The manufacturer was made aware of the failure and referred the contact to file a complaint with the NHTSA Hotline. The failure mileage was approximately 25,000.

Mileage: 25,000

The rear differential bolt is a known failure point on these cars. I see it time and time again where there is a clunk noise coming from the rear of the car and sure enough, the bolt has broken on the rear differential and leaves the car undriveable. BMW has said that they are unable to do anything without NHTSA informing them of the issue. There needs to be a recall or active service bulletin to address this issue. This failure is not a matter of “if”, it is a matter of “when”. There needs to be a stronger bolt in place otherwise it is a near $5000 repair to replace the rear differential if not covered under warranty.

Rear differential disconnected from vehicle due to mounting bolt snapping, rear differential was also previously replaced by bmw before I purchased vehicles due to rear differential failure

The differential is making clicking noises at low speed especially when on and off the gas.

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.