Ford notified its dealers last month to stop deliveries of the Mustang Mach-E due to a fault with the high voltage battery main contactors. The problem affected new cars waiting for delivery, and approximately 48,000 that had already been handed over to customers.
If the issue occurred, the Mach-E would lose all motive power, but those systems powered by the 12V battery would be unaffected, meaning the car could coast safely to a stop with power brakes and steering still active.
Ford promised a fix would be coming in the third quarter of the year, and said it may involve both software and/or parts that need to be replaced.
The automaker has now provided a fix to its dealer network, but it is only a patch that will keep the car drivable should the issue arise, and the real fix is still coming later this year.
According to details of the patch shared on the MachEForum, dealers will “reprogram the Powertrain Control Module (PCM), BECM and SOBDMC using the Ford Diagnostic Repair System.”
The reprogramming does not prevent the high voltage battery fault, but will reduce the power by approximately one-third to keep the EV drivable instead of being stranded on the side of the road needing a tow to a dealer.
The patch is available now in both Canada and the US if you visit a dealer, or you can wait until late July or early August when it is expected to be deployed over-the-air (OTA).
A full copy of the notice is below.