Tech News: Some early Mustang Mach-Es are experiencing software issues.
Charging is a common problem with electric vehicles. But some brand new Mustang Mach-E owners have encountered a particular problem: their electric SUVs won’t start even when the main battery is charged. As reported by The Verge, there’s an issue with some early Mustang Mach-E SUVs that has to do with how the much smaller 12-volt battery is charged. It’s the latest in a growing series of minor problems that came to light during the launch of Ford’s first long-range electric car.
As in other electric cars, the Mustang Mach-E maintains its 12-volt lead-acid battery by drawing power from the much larger lithium-ion battery pack. Based on owner stories across multiple forum threads, including one who spoke to The Verge, the problem is that this no longer happens when the Mustang Mach-E is plugged into an outlet to charge the larger battery pack.
This is especially a problem for owners in cold-climate areas, as Ford encourages them to leave their Mustang Mach-Es plugged in so SUVs can use power. from the grill to warm up before driving. Many of the Mustang Mach-E’s systems are powered by a 12-volt battery (as the larger battery has a high voltage), so if it runs out, the electric SUV can’t start. When this happens, owners report that the FordPass app says the vehicle is in “deep sleep” mode. Some forum members call it the “electric brick” problem.
Ford recently filed a technical service bulletin with the National Highway Traffic Safety Administration confirming that the problem has to do with the software on the powertrain control module. Ford wrote that this only pertains to Mustang Mach-E SUVs built on February 3 or earlier, which means it is possible for dozens of them to be affected.