General Motors is asking its Chevrolet Volt customers to return their vehicles to dealers so they can make repairs that will lower the risk of battery fires. The announcement comes after an investigation into a battery fire that consumed three vehicles at the National Highway Traffic Safety Administration (NHTSA) test facility. Follow-up tests to simulate the incident resulted in two out of three vehicles catching fire. GM and federal safety officials believe that the fires were caused by coolant leaking from damaged plastic casing around the batteries after a side-impact collisions. That coolant caused an electrical short, which sparked battery fires seven days to three weeks after the crashes.

Dealers will add steel plates around the Volt battery that will spread the force of a crash over a larger surface area. Tests carried out by GM and the government have shown that the repairs prevent battery damage and coolant leaks.