The issue started with a forward push while lowering my speed while coming to a stop. It then progressed to a trembling engine. Then it progressed to the car struggling to effectively switch from electric to gas and back. It then would only be usable on electric range and the engine would not start and would be greyed out. Now, it only works on engine mode, it uses fuel like a pick up truck, it loses power while driving due to trying to switch to electric mode and back, and it struggles to accelerate. It will do it while idle as well as while driving 45mph and up. It barely has any propulsion power and I have to turn my hazards on any time I am going to accelerate. If I brake hard the engine will shake violently and then shut off. I then have to switch gears from drive to park or neutral to park to drive to reengage the engine. Recently it has turned on all the accessories but the ev and the gas is greyed out and there is zero propulsion power. I replaced the 12v battery thinking it might have been dying and it still has the same issue. I read about the class action lawsuit for the BCEM and have made an appointment the dealership but when I told them what was wrong with it the said we need to wait for the diagnostics.

- Kissimmee , FL, USA

On 9/18/24 I was driving my Chevrolet 2018 Volt on a freeway, traveling at approximately 55 mph while starting to exit the freeway. In the middle of fast-moving traffic, on the freeway offramp and starting to decelerate, the car suddenly displayed a message saying "Propulsion Power is Reduced." A micro-second later, the displayed message changed to read "Action Required: Shift to Park" and in that moment I lost control of the car's powertrain. I continued to break, coming to a slow stop in the middle lane of a multi-lane offramp, with other cars speeding past and around me. I attempted to power the car down and reboot it, moving the gear shift into "Park" position as instructed, but nothing changed. The car remained totally inoperable. I was on a slight decline and noticed the car moving forward pulled by gravity, so I steered the car to the farthest right of the offramp/parallel street, where I put my hazard signals on and requested the car be towed to a mechanic. I was endangered because the car lost entire propulsion while in the middle of fast-moving freeway traffic, and fellow motorists were endangered as well. I have learned that this same behavior occurs routinely with 2nd generation Volts; that there is a special bulletin related to the car's BCEM* a related class-action lawsuit posed against GM/Chevrolet. I requested Chevrolet take preemptive action to repair the BCEM, as I am fearful the issue will repeat and cause additional danger to myself and fellow motorists, but Chevrolet says they cannot repair the part until it is diagnosed as defective... which will occur when/if the part fails again, and I'm already in danger.

- Pasadena, CA, USA

My 2018 Chevy Volt displayed a warning message of "Propulsion Power is Reduced" on the dash when I started the car in a parking garage on Saturday, March 9th around 10am. The car would not drive normally and made a strange noise. I had to stop and start the car six or so times before it drove normally for me to get home. Had this happened at high speed, it could have caused an accident or worse. I contacted the local Rockville, MD Chevrolet dealership and they ran the diagnostic test on the BECM and HPCM2 systems and performed battery capacity reset. I do not believe this software reset will correct the technical issue. According to the dealership records, such a software reset was performed in 2021 by the previous owner before we purchased the car second hand in July, 2022. The dealer would not replace the BECM unit but there is supposedly a special coverage bulletin issued by General Motors. We need the unit replaced ASAP for safety.

- Potomac, MD, USA

the vehicle will lose power without warning on a regular basis. the vehicle will also accelerate unexpectedly when switching from battery to engine power at speeds under 50 mph. I have taken the vehicle to the dealer and have been informed there is nothing they can do for me, the vehicle does not have any faulty components.

- Indianapolis, IN, USA

Going 80 mph on the freeway with adaptive crusie control on, the car begins to jerk, and the rpm's shoot up and down. The adaptive cruise control disengages, the stabiltrack, abs, and engine light turned on and the car goes into limp mode. As I slow down, the speedometer keeps increasing up to 90. After, I inspected the driver wheel speed sensor and discovered that the sensor tip in the hub had been damaged. The anti-click washer had broken and began cutting the sensor until it failed.

- Galloway, OH, USA

After fully charged my car, I pulled out of the parking garage and into an available parking stall at work on Friday January 24th 2020 at approximately 1:50pm. I let my car cruise into the stall while my foot is covering the brakes. Halfway into the parking stall, the car accelerated on its own. I applied the brakes but did not help. It stopped only when it jumped the front concrete stall with 2 front wheels and hit the trees then rolled back. I then immediately shift the gear to park. The day was sunny and road condition was dry. I was fortunate that it hit the trees and not other cars if I were to take this out on the road. The attached pictures shows tire marks as I am trying to brake and the tire wears.

- San Jose, CA, USA