2015 Chevrolet Volt: sudden loss of power

Filed Nov 14, 2025 · Electrical, Engine · FL

My 2015 Chevy Volt has been experiencing ongoing mechanical and electrical issues, including random power loss, reduced propulsion warnings, and sudden vehicle shutdowns with no prior indication. These problems pose a serious safety concern, as the car can lose power unexpectedly while driving. Despite these issues, GM has refused to service the vehicle or unlock necessary components because they no longer manufacture or support the required parts. As a result, I am left with an unsafe and unreliable vehicle with no available remedy from the manufacturer. This is forcing me to trade in the vehicle at a loss

Filed Dec 11, 2023 · Electrical, Engine · CA

This car is connected to Bouncie a device that detects when a car turns on and off, the speed, if break or acceletor are stepped on forcefully and any trips. Recently the device is detecting the engine is turned off but the car is showing no signs of struggling and its in full motion. This is new, I've tested the device in another car for two weeks hoping it was the device but I had no issues on the other vehicle. The images is just one of several occasions. The image shows green dot where car starts and red where car is turned off. However, I never turned off my car at the Demaree Rd that day. I feel like the car is losing power and starts back up while in motion.

Filed Dec 5, 2023 · Acceleration, Electrical · TX

Car experienced sudden loss of power while driving. Warning appeared 'Propulsion Power Reduced.' Was able to continue driving short distance home and parked. Attempted to recharge battery but it would not accept charge. I was able to restart car again with "Propulsion Power Reduced' and drove to dealer. Diagnosis: Body Control Module (BCM) failed. Unit was replaced. Vehicle drove normally for short period and issue repeated within one day. Returned to dealer. Issue resolved after second attempt.

Filed Jun 24, 2019 · Electrical · 95,500 miles · CA

I had my 2015 volt (at ~95000 miles) serviced at american chevrolet(modesto, ca) on june 19th for regular maintenance. I had 2 miles EV charge left leaving dealership parking. 2 min out of dealership, just before stopping at a red traffic light, I saw an error: "propulsion power is reduced" on display. Then I realized the car had no power at all. Turned off engine, and turned it back on, the screen says "initializing....." and it lasted more than 20 seconds, still no power. All cars were moving again, and I was stuck on the second to the right lane with no power! I power cycled again, still no power. Emergency lights didn't light up during initialization. This meant cars behind me wouldn't see my lights. I have a camera facing the rear, and it should have caught the horrific experience. Now came the scary part, I saw a big SUV driving at probably 60mph came right behind me!! Luckily the SUV was able to brake really hard and swerved to my right lane before rear ending me. I got out the vehicle, and started signaling to cars behind me, and all the cars now could see me and changed lanes. I called dealer, and two advisors arrived in just a few mins. They could not figure out why and gave me a ride back to dealership and told me the car would be towed back and diagnosed. My volt has been still at the dealership being test since june 19th. Today, june 24th, my chevy advisor, juan moreno called said they've done all tests, and everything has been fine, and they would do some more testing, after which I should be able to pick it up today. On june 19th, I received a letter from gm about a software update, hpcm2. I requested dealer perform the update. I don't know if the software defect caused my volt losing power. But now I really had concern over the safety of the volt as it was a family car to haul family.

Filed Mar 9, 2017 · Fuel system · 26,500 miles · CA

2/24/17 while driving on a public business 2 lane road with 30 miles battery life and 150 miles gas available, the car driving at approximately 25 miles per hour on a very slight declining slope when it completely stopped in the middle of the "fast" lane of traffic on a four lane road - two lanes in each direction. The warning "propulsion power reduced" and check engine light were both on. I was only slightly able to control the car by forcefully turning right into a driveway across another traffic lane while rolling slightly downhill. I was only able to make it into the driveway before I started rolling backwards and I forcefully had to keep my foot on the brake so the car would not roll. When I turned off the engine, the hazards went off so I had to turn the engine back on so that the hazard lights would work. The tow truck driver was able to load it onto the stake bed and told me that it was working fine. No errors on display. It sat off for about 5 minutes and he drove it onto the stake bed. The sierra chevrolet in monrovia ca had the car for a week, but said that the codes did not show up when they tested it. And they even drove the car around town for 70 miles. I explained to them that this wasn't the first time that the code showed up but the other two times, it showed up the car lost power, while driving up a hill at about 35mph, but immediately restarted itself....and the code disappeared. I informed the dealer that a full charge from my house used to be more than 40 mile range, now it is down to 30 - 35 miles...never 40. I got the car back with no work done. On the freeway it had trouble going more than 55 MPH so opted for slow lane rather than the usual car pool lane and immediately got off the freeway. This was a very straight freeway, no inclines. Problem still exists, feel manufacturer needs to be notified as it just stopped!

Filed Oct 31, 2015 · Acceleration, Fuel system · 2,000 miles · CA

Friday october 30 at 1 pm pacific coast time, my volt lost all power on the middle of the san mateo bridge. There was no shoulder and the car went from 70 miles an hour to a dead stop in about 100 ft. I had a "propulsion system failure" message on the display screen. I was nearly rear-ended by a semi, who in turn nearly turned over trying to swerve out of my lane. The semi nearly pushed another car into san francisco bay. This is a dangerous vehicle and the government should not allow it to be sold.

Filed May 4, 2015 · Engine, Fuel system · 85 miles · CA

Total loss of power climbing a hill at freeway speed. The behavior was like the car had shifted itself into neutral. This then manifested itself three other times over the next 20 miles of driving.