The 2021 Mach-E is Ford's first serious BEV attempt on a volume scale, built on a bespoke electric platform. Early examples show growing pains with software integration, thermal management, and high-voltage component quality control—typical first-year EV issues rather than powertrain mechanical failures.
High-Voltage Battery Contactors Failing (SSN 21B57)
Occasional · high severitySymptoms: Vehicle won't start or enter ready-to-drive mode, "Stop Safely Now" warning on cluster, Clicking noise from underbody when attempting to power on, Loss of all propulsion with no prior warning
Fix: Requires disconnecting HV battery pack and replacing main contactors inside battery junction box. Ford issued TSB and extended warranty coverage to 8yr/100k for affected VINs. Labor is 4-6 hours due to safety protocols and HV isolation procedures.
Estimated cost: $1,800-3,200
Front Drive Unit Seal Leaks (AWD Models)
Common · medium severityTypical onset: 25,000-60,000 mi
Symptoms: Red ATF-like fluid pooling under front of vehicle, Whining or humming from front axle during acceleration, Low fluid warning on SYNC screen (if equipped), Reduced regen braking effectiveness
Fix: Front motor/gearbox assembly uses transmission fluid for cooling and lubrication. Output shaft seal fails prematurely. Requires raising vehicle, draining unit, replacing seal and possibly output shaft if scored. 3-5 hours labor. Some units need complete drive unit replacement if internal damage occurred from running low.
Estimated cost: $900-2,400
12V Battery Premature Failure
Common · medium severitySymptoms: Vehicle won't power up despite full HV battery charge, Infotainment system reboots randomly while driving, Door handles won't present (frameless doors won't open), "12V Battery System Fault" message
Fix: Factory 12V AGM battery (located in frunk) frequently fails within first 24 months due to charge management software bugs in early builds. Ford released OTA updates to improve DC-DC converter behavior, but many batteries were already damaged. Replacement is straightforward—0.5 hour job—but requires SYNC module keep-alive during swap.
Estimated cost: $300-500
Panoramic Glass Roof Leaks at A-Pillar
Occasional · low severitySymptoms: Water dripping from headliner near dome light, Wet carpet on driver/passenger floor after car wash or rain, Musty smell in cabin, Condensation visible inside glass roof seal
Fix: Factory-installed glass roof drains clog easily or adhesive on front glass edge wicks water. Requires cleaning drains (simple) or removing headliner and resealing glass (8-10 hours if full reseal needed). Many dealers have applied revised seal kits under goodwill.
Estimated cost: $400-1,800
Rear Motor Inverter Overheating (GT and Extended Range AWD)
Rare · high severitySymptoms: Sudden loss of power during spirited driving or highway merging, "Powertrain Malfunction" warning, Reduced top speed limiter engaged (vehicle stuck at 65-70 mph), Cooling fans running at max after parking
Fix: Rear inverter cooling system has inadequate flow in some units, causing thermal shutdown under sustained load. Ford issued recall 22S41 for software calibration, but some units need physical inverter replacement. Inverter R&R is 6-8 hours—requires dropping rear subframe and disconnecting HV cables. Dealer-only repair due to HV certification requirements.
Estimated cost: $4,500-7,000
SYNC 4A Infotainment Freezes/Black Screen
Common · low severitySymptoms: 15.5-inch screen goes black and won't wake, HVAC controls unresponsive (all climate control is via screen), Backup camera doesn't display when in reverse, Charging status and range unavailable
Fix: Software bug in early SYNC 4A builds causes APIM module to lock up. Hard reset (hold volume down + skip forward 10 seconds) usually recovers it temporarily. Permanent fix requires dealer OTA update or manual APIM reflash (1 hour). Some units need APIM replacement if corrupted ($1,200 part). Ford extended warranty to 5yr/60k on APIM for known-bad VINs.
Estimated cost: $0-1,800
Solid used buy if you can verify contactor/inverter recalls completed and it has recent SYNC updates—most issues are early-production teething and covered under remaining factory 3yr/36k or 8yr/100k HV warranty.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.