Power Train Problems of BMW 740

My 2023 BMW 740i has experienced the same serious failure twice at approximately 21,000 miles. The exact component causing the failure is currently unknown. The vehicle is available for inspection and is currently being returned to an authorized BMW dealer for diagnosis. During the first incident, while driving, multiple warnings suddenly appeared involving chassis stabilization, regenerative braking, the parking brake/roll-away system and drivetrain. The warnings escalated to “stop. Apply parking brake” and “drivetrain malfunction. You cannot continue driving. ” shortly afterward, the vehicle became completely immobilized and could not be shifted into drive, reverse or neutral. It had to be towed to an authorized BMW dealer. BMW diagnosed the first incident as a failed 12v battery and replaced the battery under warranty. Only days after receiving the vehicle back with the new battery, the same failure occurred again while I was driving. Warning messages appeared stating “drive carefully. Chassis stabilization,” “regenerative braking,” and “vehicle may roll. Brake manually. ” the vehicle then displayed “stop. Apply parking brake. Drivetrain malfunction. You cannot continue driving. ” once the final warning appeared, I had approximately 30 seconds to get out of active traffic before the vehicle became completely immobilized. I was fortunate to reach a parking area. Once stopped, the vehicle again could not be shifted into drive, reverse or neutral and required another tow. My primary safety concern is the extremely short amount of time between the warning to stop driving and complete immobilization. If this occurred on an interstate, railroad crossing, busy intersection or another location without an immediate safe place to stop, the vehicle could become disabled in active traffic. The first BMW repair did not correct the condition. The vehicle is now undergoing diagnosis for the second occurrence.

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I pulled my 2019 BMW 740i out of a residential garage and stopped the vehicle. I opened the driver's door and exited the vehicle to enter the code on the exterior garage keypad to close the garage door. After entering the code, I turned around to return to the vehicle and observed that the BMW had begun moving unexpectedly. The vehicle continued moving and ultimately crashed into a tree, causing substantial front-end damage. I did not intend or expect the vehicle to move after I exited it. I expected the vehicle's systems to secure the vehicle when I exited, but when I turned around, the vehicle was moving. I am concerned that a system intended to prevent unintended vehicle movement—including the transmission park function, electronic/automatic parking brake, or associated electronic control system—may not have operated as expected. The specific cause has not yet been determined. A BMW certified collision center has estimated approximately $26,000–$27,000 in repairs, and my insurance carrier is evaluating the vehicle as a potential total loss. I have requested preservation of the vehicle and available electronic/diagnostic data so that the cause of the unexpected movement can be investigated. I am reporting this incident as a potential safety-related malfunction involving unintended vehicle movement/rollaway and am requesting that it be reviewed accordingly.

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Component/system that failed: the rear differential failed internally, causing the left rear axle to separate from the differential housing. BMW’s own service center confirmed there was no external damage or outside force involved. The defective parts are currently with BMW of manhattan and can be made available for inspection. Safety risk posed: this failure created a significant safety hazard, as drivetrain separation while in motion can lead to loss of vehicle control, wheel lock, or a collision — especially at highway speeds. Fortunately, no accident occurred, but the risk was high. Was the problem confirmed by a dealer? yes. BMW of manhattan confirmed the failure in service invoice #1201464. Their technician wrote: “found left rear axle is popped out of differential. No signs of damage or outside influence. Differential is internally faulty. ” the dealership replaced the rear differential and associated components under warranty. Was the vehicle inspected by others? the vehicle was only inspected and repaired by BMW of manhattan, an authorized dealership. No police or insurance inspection occurred. Warning signs before failure? yes. The vehicle was brought to the dealership on four separate occasions before the failure due •loud noises from the rear axle area, •causing the abnormal wear and tear of tires , and •erratic driving behavior. Each time, BMW’s service team stated the vehicle was “in healthy shape. ” additional context: despite this failure being documented as internal and not customer-induced, BMW north America has refused to accept responsibility or honor a buyback request. The vehicle is used for business purposes under cuatro sons inc. And has now been taken off the road due to the safety risk and unresolved concerns about reliability. We are seeking NHTSA’s investigation and intervention.

Traction control warning light. BMW service center says that they can't communicate with my vehicle thereby can't diagnose problem(s). Vehicle stationary in shop.

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The contact owns a 1998 BMW 740il. The contact stated that the vehicle would jerk violently when changing gears. The vehicle was taken to a local mechanic who diagnosed that there was a defective ring gear in the transmission. The dealer and the manufacturer were notified of the failure, but advised that the vehicle was not included in the recall associated with NHTSA campaign id number: 99v005000 (power train:automatic transmission). The vehicle was not repaired. The failure mileage was 100,000 and the current mileage was 180,000.

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