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A Chevrolet Bolt charges at an Electrify America site outside Colorado Mills outlet mall in downtown Lakewood, Colo.

David Zalubowski/The Associated Press

General Motors is telling owners of some older Chevrolet Bolts to park them outdoors and not to charge them overnight because two of the electric cars caught fire after recall repairs were made.

The company said Wednesday that the request covers 2017 through 2019 Bolts that were part of a group that was recalled earlier due to fires in the batteries.

The latest request comes after two Bolts that had gotten recall repairs caught fire, one in Vermont and the other in New Jersey, GM spokesman Kevin Kelly said.

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Owners should take the steps “out of an abundance of caution,” he said. The steps should be continued until GM engineers investigate and develop a repair, he said.

“We are moving as quickly as we can to investigate this issue,” GM said in a statement.

In April, GM announced that it had developed diagnostic software to look for anomalies in the batteries of 69,000 Bolts worldwide. If problems are found, the company will replace faulty parts of the battery.

Kelly said owners who haven’t had the recall repairs done should still take their cars to dealers to get the fixes.

In November, GM recalled the electric vehicles after getting reports of battery fires. Two people suffered smoke inhalation and a house was set ablaze.

At first the company didn’t know what was causing the problem, but it determined that batteries that caught fire were near a full charge. So as a temporary fix, owners and dealers were told to make software changes to limit charging to 90% of a battery’s capacity.

GM traced the fires to what it called a rare manufacturing defect in battery modules. It can cause a short in a cell, which can trigger a fire. Under the remedy, dealers were to install software designed to warn owners of problems, and any defective cells were to be replaced.

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Each Bolt has 288 battery cells, and engineers worked to analyze data from hundreds of thousands of cells, Flores said.

The recall came after the U.S. National Highway Traffic Safety Administration opened an investigation into the fires last year. The agency said in documents that the fires began under the rear seat while the cars were parked and unattended.

Engineers determined the fires took place in Bolts with battery cells made at an LG Chem factory in Ochang, South Korea, from May of 2016 to May of 2019.

Some 2019 Bolts and all 2020 and 2021 versions have cells made at an LG Chem plant in Holland, Michigan, and are not included in the recall.

Once the final recall repairs are made, the Bolts’ full range will be restored. Older Bolts can go about 383 kilometers per charge.

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