2023 CHEVROLET BOLT EUV Vehicle Speed Control Problems

While car was on a warning popped up saying "Service Transmission" and then another warning popped up saying "Propulsion Power is Reduced". This then limited the speed of the car and the acceleration significantly making it extremely unsafe to drive. Thankfully I was not on the interstate, but I certainly would have been hit if I was. This car is less than 2 years old, has under 10,000 miles, and his had all recommended maintenance done.

I was driving on a highway at approximately 68 MPH. There were no cars in front of me and none beside. The adaptive cruise control system was engaged. The car applied the brakes without warning, as if I was a going to collide with another vehicle. I depressed the brake to turn off the system and hit the gas pedal.

The adaptive cruise control as well as regular cruise control limits the electronic braking to 10 kW. After that the friction brakes take over. There is little indication of it, and I think it's a safety risk because in hilly areas, as well as mountainous roads, the friction brakes activate risking overheating the brakes and a brake failure. I believe the earlier model years would not limit the electronic braking and would maintain the speed down hills using regenerative braking exclusively.

The contact owns a 2023 Chevrolet Bolt EUV. The contact stated while driving at approximately 3 MPH and turning into a parking spot, the contact stated that the vehicle independently accelerated, drove over the parking bumper, and crashed into a tree. The contact stated that the front passenger lights and the front passenger side grill were damaged. The contact stated no warning light was illuminated. The contact was unhurt. The contact had taken the vehicle to a collision repair shop. The vehicle was not diagnosed and was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 5,000.

Mileage: 5,000

The situation occurs when using supercruise (GM’s lane centering and adaptive cruise control system). Under certain conditions with super cruise engaged and one pedal drive mode active, pressing the cancel cruise button (example: taking manual control briefly in order to allow a merging car into your lane) causes the vehicle to abruptly decelerate without the ability to override with the pedal. This uncontrollable abrupt deceleration poses a hazard to vehicles behind me. This deceleration can only really be overridden by proactively pressing on the accelerator prior to disengaging the super cruise system. I suspect this problem is caused by logic in the super cruise system which does not allow the vehicle to accelerate while the steering wheel is flashing red (such as during disengagement). Generally, removing the flashing red condition from the steering wheel requires applying torque to the steering wheel. However, this is not practical when driving straight and needing to disengage the system. The supercruise system needs to be able to safely and properly disengage at the press of a button without needing to step on the accelerator. I believe that disengaging supercruise without pressure on the accelerator pedal should lead to the car defaulting to going into maximum one pedal braking yet still being able to accelerate on command if needed. The current state of the system requires torque on the steering wheel in order to be able to accelerate out of such a situation.

While turning into a parking space, my car unexpectedly accelerated rapidly. My car crashed into a concrete barrier damaging the front end and tossing items around the car. Additional details: I was driving my car in single-pedal mode. In this mode, when you lift your foot from the accelerator, the car automatically brakes. I have a lot of experience in single-pedal mode, and I am very familiar and comfortable with how it works. On the morning in question, I was coming around a corner in an underground parking garage, and pulling into a parking space immediately around the corner. To do this, I was making a hair pin turn, moving at very slow speed. I was pulling in alongside a car that was already parked there. When the front of my car was in the space and I was completing my turn, I lifted my foot from the accelerator, and the car suddenly lurched forward at high speed. Before I could recover, the car crashed into a high concrete curb that marked the end of the parking space. The front bumper of my car was damaged and items flew off the seats of my car onto the floor. I was shaken up, but the air bags did not deploy. I was able to back out, complete parking, and proceed with my day. If this had happened in other circumstances, it could have led to loss of life. If I was on a street, and pedestrians were walking, for example. If the concrete curb had not been there to stop me, I don't know what would have happened. If another car had been where the curb was, it would have been damaged. This has only happened once. We haven't tried to reproduce it. I have continued to drive the car, and it has been fine. There were no indications (warning lights, etc) that this was going to happen. No warning lights have gone on since it happened. The car has not yet been inspected, but I plan on bringing it to the dealership to have it checked out. I did not file a police or insurance report.

One pedal speed control was used to slow down and stop the car approaching a busy intersection. The car came to a complete stop and was idle at the intersection. While stopped at the red light, the car suddenly accelerated into oncoming traffic and was directly heading towards a head-on collision. The driver turned the car to the left, avoiding injury, however, a party in the other vehicle was injured. The Chevy Bolt received extensive damage and was totaled. The police filed a report and the insurance company inspected the vehicle and has taken possession of the vehicle.

Adaptive cruise failed just over 2k miles following another vehicle under 60mph and sped up to set cruise of 75 and would have hit the truck if I didn’t stop it, I took video of failure directly after the incident. First bolt EUV camera failed more than once even after it was replaced, that car was bought back under battery recall. My point is, it’s a continued issue. With lane keep assist you must always be prepared for it not to function, it doesn’t always work and have to cycle the on/off button (same with previous EUV too). While in super cruise in my current vehicle it tried to locate the left lane but a big rig was on the line and my car appeared it was going to hit the truck multiple times within a few seconds as each time I had to bring the car back to the center until I turned it off. I have parts on order but I personally don’t believe that will be the end of based upon my two vehicles.

While merging onto a highway with a 60 mph speed limit, we got an error message that there was a propulsion system error and our speed was limited to 30 mph. Our car slowed down and could not accelerate. There was no warning before the speed was limited and no way to change course. It was Saturday night Nov. 25th and we had our one and half year old daughter in the backseat. Thank god my husband was able to react quickly and that there was shoulder for us to pull over on. Honestly we could have been killed or seriously injured. It’s a huge safety issue that the car will suddenly, without any warning, prevent you from going above a certain speed. The purpose is to protect the car, as I understand it, but there should at the very least be a countdown. I’m incredibly grateful I can report this to and that there wasn’t a tragic accident, but if this how this feature operates, it only a matter of time before there is one. Also there is less than 1000 miles on our car.

What component or system failed or malfunctioned, and is it available for inspection upon request? The Transmission Fluid Pump failed, and is needing to be replaced. The car only had 200 miles on it and was bought 5 days prior before the issue began. How was your safety or the safety of others put at risk? The car immediatley reduced my speed to 30mph. I was driving on an expressway, and caused me to slow traffic. Has the problem been reproduced or confirmed by a dealer or independent service center? Yea, I have the error code given to me by OnStar: P2797 Auxilliary Transmission Fluid Pump error Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? The vehicle has been brought into a Chevrolet service center and awaiting for a replacement part from GM. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? The check engine light came on and then the car immediately slowed my speed.

I, and many other owners of Chevy Bolts are having our speed suddenly reduced without warning. The vehicle immediately drops to a max speed of 30 mph and gives an error message "Propulsion Power is Reduced". One common cause seems to be defective transmission fluid pumps, although other electrical and mechanical components also seem to cause this problem. One common error code seems to be P2797, along with the "Propulsion Power is Reduced" message. This dangerous speed reduction is sometimes happening in dangerous situations, while driving in heavy traffic and at high speeds on highways. This is an incredibly dangerous defect and could easily cause car accidents, injuries or death. People are also being stranded without warning. There are many posts (dozens+) about this on various owners groups, including Reddit, Facebook groups and others. The Bolt brake lights and turn signals are also placed in very bad locations which are not obvious or visible, which is also incredibly dangerous.

I was driving on CT Route 2 using super cruise. We came upon a construction zone and the bar on the steering wheel changed from green to red. The car came to a complete stop in the middle of the highway and didn't respond to the accelerator pedal. This is a frightening situation on a super highway. I tried pressing the buttons that turn on and off the cruise control, super cruise, etc. with no effect. Cars behind me passed on the left and right. I finally tried putting the car in Park and back into Drive. From that point on it worked normally. This is the second time this happened. The first time I had only had the car for a week, so I thought it was just a mistake on my part. I did have a dash cam running, but the files are too large. I will keep them on my computer should you wish to have them. The consumer stated that during this incident, they could not take over control from the Super Cruise.