The US National Highway Traffic Safety Administration said that a prelimary probe into certain General Motors (GM) hybrid vehicles over concerns related to battery control module was closed Tuesday amid a low number of safety-related occurrences.

The investigation was launched in 2023 and covered Chevrolet's plug-in-hybrid Volt models from model years 2016 to 2019, the NHTSA said.

The probe covered allegations of a loss of motive power, including a stall, reduced power state, and/or a no start condition due to the battery energy control module.

GM previously said the root cause was identified as an internal failure resulting in a loss of communication within the module and did not pose a risk to vehicle safety, according to the NHTSA.

The NHTSA said that the closing of the investigation does not constitute a finding by the auto safety regulator that a safety-related defect does not exist.

GM did not immediately reply to MT Newswires' request for comment.