While driving vehicle continues to drop into reduced power mode causing a jarring motion as it drops a significant amount of speed, almost causing multiple accidents. The check engine light comes on, traction control turns off, stabillitrack turns off, and engine goes into limp mode and starts shaking and jarring. The same 2 codes continue to come up in diagnosis. P2135 and P2176. I have taken the vehicle to three mechanics 1 of them being Chevy its self. With no solution found. I have had the acceleration pedal replaced, the wiring replaced, the ignition switch and relay replaced had the throttle body connector replaced, the throttle body and gasket replaced 3 times. I have done everything recommended by all shops including Chevy. Please help as the truck has been in the shop more then it has been on the road and I have almost been in multiple accidents as the truck is difficult to control when the issue happens.

- Stephenson, VA, USA

While driving around 60 mph the car does a massive shake. Check engine light comes on, stabilization turns off, traction controls turns off and engine power is reduced first to 10mph and could not get more than 30mph. I was almost hit by an 18 wheeler due to my sudden stop. The SUV is now in engine power reduced mode.

- Fredericksburg, VA, USA

The contact owns a 2013 Chevrolet Tahoe. While driving 40 mph, the vehicle hesitated and lost power as if it would stall without warning. The air bag light illuminated and the vehicle did not respond when the accelerator pedal was depressed. The contact also stated that the radio powered on and off. The doors locked and unlocked on their own. The contact pulled the vehicle over, waited a few minutes, and proceeded to drive. The failure recurred. The vehicle was not taken to a dealer. The manufacturer was not made aware of the failure. The failure mileage was 40,000.

- Stockton, CA, USA

2013 Chevrolet Tahoe. Representative from the city writes in regards to problems with police fleet. The consumer stated after the new engine calibrations were installed on seven vehicles, less than 24 hours later, the problem continued, along with additional issues and problems that were never experienced before. Specifically, the vehicles lunged forward aggressively after coming to a stop. GM eventually removed the calibrations. The issue with the vehicles stalling, lack of power, idle surging and hesitation upon acceleration, continued.

- Miami Gardens, FL, USA

While driving the speedometer is showing 0 on both the digital display and analog needle display. Also it is showing that the vehicle is in park. Only by pulling over and starting the car up again (~5 minutes), the problem goes away.

- Belmont, CA, USA