Vehicle shuts off randomly from stop to auto start transition feature. Modules has been updated to latest version. Problem still accumulating hybrid batteries soc 60% battery temperature inlet 81F outlet 107F 340volt total charge in the event of problem accured. Aux trans pump and module replaced new. Hybrid battery cooling fan replaced new. Problem still exist dealer cannot find the problem or they dont want to deal. In the even of shut off I loose brake power and steering power which I can not stop or steer the vehicle to pull over this results in serious safety issue.

- Jacksonville, FL, USA

The contact owns a 2008 Chevrolet Tahoe hybrid. While driving 20 mph, the brakes failed to engage without warning. In order to stop the vehicle, the emergency brake had to be engaged. The vehicle was taken to the dealer. The technician was unable to diagnose the cause of the failure. The manufacturer was made aware of the failure. The vehicle was not repaired. The failure mileage was 107,000.

- Snohomish, WA, USA

The contact owns a 2008 Chevrolet Tahoe hybrid. The contact stated that while driving approximately 50 mph, the vehicle stalled after depressing the brake pedal. After the failure occurred, the check engine warning indicator illuminated. The contact stated that the vehicle could be operated after the failure using the vehicle manual control feature. The vehicle was taken to the dealer and an independent mechanic where it was diagnosed that the entire electronic brake control module needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate vehicle failure mileage was approximately 142,000.

- Oneonta, NY, USA

When pushing the brake pedal the vehicle started to shake/vibrate as if the ABS was activated when I got to work, and even when place the vehicle in to park and pushed the brake pedal the same vibration happened. I rushed to the dealership had to drive on hwy to get there kept at min speeds as possible and not using brakes at all. While approaching an exit ramp, I applied my brakes they locked up ( it really scared me) then the ABS vibrating came back again. As I was approaching my house and hit the brakes again found I had none had to use emergency foot brake to stop. After over night on my driveway attempted to take the vehicle to the dealer and the brakes started to work kind of with the same ABS vibration problem. Dropped it of at the dealer at valley Buick GMC on sat 06/28/14, on Monday the dealer tells me its a bpmv brake pressure modular valve needs to be replaced and that it will take 3-4 weeks to get the parts. 1st of all it was scary enough to lose the brakes and now 2 weeks later renting a car out of my own pocket $600 out and now going onto 3rd week another $250 expenses, as of today 7/14/14 dealer part says they have no idea when the part will be shipped. Called GM customer service and they say there is no recall on this issue (they have to wait till enough people die or get hurt), so they transfer me to the dealer that has my vehicle with no idea when the part will come. I love the hybrid Tahoe but this is how GM take care of their customers I don't think I will be buying a new Tahoe.

- Apple Valley, MN, USA

Started car, put in gear, depressed brake pedal, and it went nearly to the floor. No vacuum assist and the car was very hard to stop even at a rolling speed. The following lights illuminated: Check engine light, stabilitrack indicator light, ABS warning light, brake system warning light. The following displayed on odometer screen: Service stabilitrack, service traction control, service brakes soon. Vehicle has been at dealership for 2 weeks, with repeated calls to GM engineers, who first recommended replacing the master cylinder, which cost $1000 and did not fix the problem. Since then, the engineers apparently say it is the hybrid brake valve modulator that has failed, which will cost additional $2300; however, the dealer cannot get the part and not sure if this will fix it. This hybrid braking system is defective and dangerous!! I cannot imagine what would have happened had I been driving at full speed. In reading forums, I am not the only one with this issue. I hope the NHTSA reads this with all the recalls and coverups that GM has had to deal with in the past few months. A recall should be issued.

- Greenville, SC, USA

The contact owns a 2008 Chevrolet Tahoe hybrid. The contact stated while driving approximately 30 mph, he applied the brakes and there was a slight response. The traction control, stability trak warning indicators and the service brake soon warning lights illuminated. The vehicle was maneuvered to the emergency lane where the engine was turned off. Upon restarting, the vehicle resumed normally although the check engine warning indicator illuminated. The failure recurred ten times. The vehicle was taken to an authorized dealer for diagnosis. The failure was contributed to the computer sensor and the vehicle was repaired. Eleven months after the repair was performed, the failure recurred. The vehicle was not repaired for the most recent defect. The manufacturer was notified of the failure. The approximate failure mileage was 60,000.

- Bowie, MD, USA

While approaching an intersection with vehicles approaching from several directions, I applied my brakes but found I had none. Fortunately, the other cars noted my situation and stopped for me. There was a GM dealer one block away, so I slowly drove there. I turned off the ignition. I re-started the vehicle and found I had brakes again. I slowly drove to village Chevrolet which was not far away. I was told the ebcm and bpmv were not builing pressure for the booster. They serviced and reprogrammed and delivered the vehicle the next day. On January 14, 2013, while driving I noted that again I did not have brakes. Fortunately, I was in a low traffic volume situation and I was able to slow to a stop. Again, village Chevrolet was not far away so I took the vehicle in for service. The bpmv and the tansmission auxiliary fluid pump were replaced at a cost of $2,700. It is of concern that new brake design and technology is such that one cannot gain functional brake repair at a reasonable cost. This was my sixth Tahoe from village Chevrolet but it is my last GM purchase. I understand the vehicle is out of warranty, but village Chevrolet says they have not have any similar problems. If that is the case, why would the company not stand behind new models with new technology for a basic need such as brakes. What if I had been driving on the freeway at 70 mph? now, while braking, I note a difference in pedal pressure during the braking process. I am going to have the vehicle checked at a different dealer. Brakes are not just important, they are essential!! while the financial circumstances are disappointing, my main concern is the brake safety issue.

- Eden Prairie, MN, USA