Ford has issued yet another new recall, this time affecting 42,784 Mustang Mach-E in the United States after discovering a defect in the rear differential that could cause drivers to lose propulsion or allow the vehicle to roll unexpectedly while parked.
Transport Canada has not yet issued a similar recall.
According to documents filed with the National Highway Traffic Safety Administration (NHTSA), the recall applies to 2021-2023 Mustang Mach-E rear-wheel drive (RWD) models built between March 2020 and August 2025 where the rear differential pinion shaft can fracture due to bending fatigue.
If the component fails while driving, owners could experience a sudden loss of drive power, or the vehicle could move even after Park has been selected if the parking brake is not applied.
The automaker began investigating the issue in March 2026 after engineers analyzed a failed rear differential recovered from a 2023 Mustang Mach-E in Europe. Additional inspections of warranty-returned components identified several more pinion shafts with the same fatigue-related failure pattern.
While Ford and supplier BorgWarner found inconsistencies in the hardness of some components, the company says the root cause of the fatigue failure remains under investigation.
As of June 11, Ford had received 62 warranty claims, 14 internal quality reports, four customer reports, and two European field alerts related to the issue. The company said it is not aware of any crashes, injuries, or fires linked to the defect.
The fix will not be over-the-air (OTA), but will instead involve dealers inspecting the rear differential assembly and repairing or replacing it as necessary at no cost to owners. Replacement units will include an updated pinion shaft designed to better withstand bending fatigue.
However, owners will have to wait for the permanent fix. The final repair is expected to become available in late December.
Until repairs are completed, owners are advised to always apply the parking brake when parking their vehicle to reduce the risk of unintended movement.
You can read the full NHTSA recall notice below.
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