Following 61 complaints and a number of field reports from owners who have alleged that their 2016-2019 Chevrolet Volts are experiencing energy loss although on the road, the National Highway Traffic Safety Administration (NHTSA) has initiated a preliminary evaluation into this achievable concern.

The concern pertains to the plug-in hybrid Chevrolet Volt, whose Battery Energy Control Module (BECM) could be at the root of the issue. Customers have reported incidents in which their automobiles stalled, entered decreased energy states, seasoned no-commence situations, and most regarding of all, lost motive energy although in motion.

Naturally, that is a concern to NHTSA, which notes that a stalled car can turn out to be a danger on the road. Moreover, if the driver has no way of restarting the car, that puts them and other road customers at danger of a collision.

Read: Chevy Dealer Quoted Volt Hybrid Owner Nearly $30,000 To Replace Battery (Update)

Although the investigation into the issue is ongoing, NHTSA states that GM has currently released a Technical Service Bulletin (TSB) about the 2016-2019 Volt’s BECM. However, that filing only issues a no-commence situation or the illumination of malfunction lamps. The automaker discovered that replacing and reprogramming the BECM fixed the issue.

GM stated it was cooperating with NHTSA on its investigation, per Reuters. It added that it believes it has “taken appropriate action to remedy customer concerns related to the battery energy control module but will continue to support the agency’s review of the matter.”

However, some owners complain they have been waiting for months, or have been entirely unable to get a replacement battery module following experiencing an concern. GM stated it has replacement components in the provide pipeline.

NHTSA’s preliminary evaluation is not a recall. However, it will be seeking at the scale and scope of the concern, as effectively as its prospective to result in harm, and could compel GM to commence a recall on as numerous as 72,926 Volts, primarily based on the benefits of its investigation.