'11 Chevy Volt hybrid was daily driver of 100+ miles, multiple trips both highway and city for last 2 1/2 months. Breaks and rotors have been replaced all the way around, fresh oil changes as needed and filters. Warning on dash "Service High Voltage Charging System", -??Service Airbag" and check engine light have been on since I've owned it (Oct. 23). When plug car in it doesn't charge, but the EV charges while driving. Car generally switches back and forth from EV to ICE without issues. No other issues have been noted. 1/18/24 Start car and drive all day for work. Total of 129 miles between 22 trips. Last trip car sat for 30 minutes after running deliveries all day. Started as normal, turned off at gas station, filled tank with premium, restarted and drive to freeway. Drove 20 miles, pulled over to text, put car in park. 5 mins later took out of park and car wouldn't move. Inside had complete power, radio, windows, ect. Only noticable difference was car would get no acceleration, power steering went out, and heat started blowing cooler air. Absolutely no warning and car just cuts off engines. Thankfully I was parked safe. Towed home, replaced 12v. Started and drove no problem on 1/19/24. No new warnings or anything different. Started up 1/20/24 drove 7 miles and the engines cut off in the middle of a main road while accelerating, once again no warning. Luckily got into turn lane before almost getting hit. Still not sure what's wrong with car. Same codes. No battery warning or loss of power indication at all. Just up and cuts off. This is very very dangerous and needs to be looked into please. When my volt died today the truck behind me had to slam on his brakes and came inches from hitting me. If this would've happen on the freeway, I'd likely been hit.

- Hazel Park , MI, USA

The contact owns a 2011 Chevrolet Volt. The contact stated that while driving at an undisclosed speed, the contact heard an abnormal whining sound coming from the engine compartment. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure but provided no assistance. The failure mileage was approximately 90,000.

- Concord, CA, USA

My 2011 Volt frequently shows "propulsion power reduced" after the battery has been depleted and on restart. This affects performance, acceleration and thus safety for several minutes until the system rebalances itself. This condition began back in 2015 several years ago but is first noted in dealer's records at 101,000 miles. The car has 142,000 now. It has been in the shop several times asking for this condition to be repaired as the problem became more frequent. It appears to have had the software update you reference in your bulletin that may cause the problem. The condition is identical to that in your recall 18215, reference number N172130460. Please contact me for more information. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Austin, TX, USA

When the engine is turned off a warning light comes on stating that the vehicle is not in park. However, the engine is in park. Engine does not want to shut down.

- Laguna Beach, CA, USA