2024 BMW IX Transmission and drivetrain Problems

“My BMW experienced repeated drivetrain, chassis, rollaway and other electronic malfunction warnings. After the warnings appeared, the vehicle behaved unpredictably. On multiple occasions, after I released the brake pedal, the vehicle unexpectedly increased speed rather than slowing. On other occasions, while traveling approximately 55 mph, it suddenly slowed to about 20 mph, and pressing the accelerator firmly did not restore speed. These incidents created a serious collision risk, including while transporting my four young children. …”

“Vehicle has displayed drivetrain and high-voltage-battery fault warnings on three separate occasions — December 2024, July 2025 (after replacement of a high-voltage-battery cell), and September 2025. Despite multiple service visits and nearly 90 days out of service, the same safety-related warnings have recurred. BMW NA and the servicing dealer (Chapman BMW Chandler, AZ) ultimately returned the vehicle to me in October 2025 without further repair, stating only a “courtesy recheck” was performed. …”

“Drove the car and parked it. Went into the store and got back into the car. Turned the car on and it had an emergency light saying a drive train malfunction had occurred and that the car could not drive and had to be towed to the dealer for repair. Turned on and off the car. It still had the malfunction. Had the car towed to the BMW dealer. They tested it and came up with 7 codes of malfunction: charging unit, supply voltage, acceleration, drive function, ethernet and transmitter unit, battery below storability, electric a/c compressor. They reset the car and the codes went off. …”