The contact owns a 2006 BMW Z4. The contact stated that the vehicle suddenly accelerated independently. The failure was experienced several times while driving at various speeds. The contact believed that the cruise control caused the vehicle to suddenly accelerate because once the vehicle decelerated to normal speed, the vehicle continued to accelerate gradually at a higher speed. The vehicle was taken to the dealer where a diagnostic was performed that was unable to locate the failure. The vehicle was not repaired. The vehicle was left with the dealer for further inspection. The failure mileage was 44,000 and the current mileage was 54,000.

- Arcata, CA, USA

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.

- Kingwood, TX, USA