Automatic Transmission Problems of BMW Z4

This report concerns a safety issue with a 2006 BMW Z4 with a 3. 0 engine and automatic transmission. The vehicle has an intermittent problem that began earlier this year. The vehicle will begin accelerating without depressing the accelerator and will sometimes maintain a constant speed when the foot is taken off the accelerator. It will accelerate well past 100mph without stopping. The three ways that stop the sudden acceleration is to 1. Apply the brakes, 2. Put the gear selector into neutral, or 3. Tap the off position on the cruise control lever. Cruise control has never been utilized when the vehicle has experienced this unintended acceleration. There are no floor mats in the vehicle that could impede the functioning of the accelerator. This vehicle has been taken to the dealer for service on multiple occasions. A tech working on the vehicle stated that he believed it was a cruise control sensor, but the shop foreman determined there was nothing wrong. BMW of north America inspected the car and have stated that they will stand by their product and that no defect exists. ¿ I have provided video documentation of this issue to BMW.

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The contact owns a 2004 BMW Z4. The contact stated that upon entering her vehicle and starting it, she was unable to shift the vehicle into any gear. The vehicle was inspected by a dealer who informed the contact that she would need to replace the automatic manual transmission. The vehicle was repaired yet the failure recurred within 32,000 miles. The manufacturer was contacted and informed the contact that they were unable to assist with repairs. The failure mileage was approximately 41,900.

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