Ford Mustang Mach E
Problems & Worst Years

Nearly half of all reported problems on the 2021 Ford Mustang Mach-E carry a safety rating — eight of seventeen — among the highest safety-to-problem ratios anywhere in this hub. The 243 total occurrences that year are led by 43 reports of high-voltage battery junction box failure, 32 describing unintended acceleration, 25 of pre-collision assist malfunction, 23 of camera system failures, and 23 more describing a powertrain malfunction — all five of the top-reported issues carry safety severity, not just high or medium.

The 2022 model year shows markedly fewer total complaints, 59 across 14 problems, but the same core defect persists: high-voltage battery junction box failure again tops the list with 18 reports, still safety-rated. Unintended acceleration recurs at a smaller scale (6 reports), joined by forward collision avoidance system failure (5), vehicle speed control malfunction (4), and adaptive cruise control malfunction (4).

The throughline between both years is the high-voltage battery junction box showing up as the single largest complaint category in 2021 and 2022 alike, and it's rated safety severity both times. Anyone shopping either year should ask a shop familiar with high-voltage battery systems to specifically check this component's service history and confirm there's no outstanding open issue tied to it, and should also test the pre-collision and adaptive cruise features carefully during a demo drive given how often camera and collision-assist systems show up in the complaint file.

The drop in raw numbers from 2021 to 2022 is worth taking with a grain of salt: it may reflect a genuine improvement, but it can just as easily reflect a newer model year having had less time on the road to accumulate owner reports. Complaint counts are a record of what drivers chose to file with NHTSA, not a precise measurement of defect rates, and a specific vehicle's inspection and service history should carry more weight than either model year here.