DETROIT (AP) — Multiple U.S. owners of Hyundai's popular Ioniq 5 electric SUV have complained of completely or partially losing propulsive power, many after hearing a loud popping noise, the National Highway Traffic Safety Administration said Saturday.

The agency said in a notice posted online that it received 30 complaints about the problem in 2022 models, of which it estimated 39,500 were on U.S. highways.

The Office of Defects Investigation at the NHTSA has opened a preliminary investigation and says Hyundai indicated in an initial review that a power surge was damaging transistors, preventing vehicles' 12-volt battery from recharging.

A Hyundai spokesperson did not immediately respond to phone and email queries from The Associated Press asking if the complaints might lead to a service recall.

Technical problems accompanying automakers' growing global rollout of electric vehicles to fight climate change have included battery recalls because of the potential for fires. Last month, Jaguar recalled more than 6,000 I-Pace electric SUVs in the U.S. due to the risk of the high-voltage battery catching fire.

General Motors, Mercedes-Benz, Hyundai, Stellantis and Volkswagen have also issued recalls since February of 2020, most due to internal battery failures that can increase the risk of fires.

The U.S. National Transportation Safety Board also investigated a series of fires in Tesla vehicles and said the high-voltage lithium-ion batteries pose safety risks to first responders after crashes.

Many governments are counting on EVs to replace gasoline-burning vehicles that emit greenhouse gases that cause global warming.