ProblemsByVin Engines / All Families
4 engine families · 75,041 owner complaints
Engine families with documented problems
Engine families with widespread defect patterns — class actions, NHTSA investigations, manufacturer bulletins, or thousands of owner complaints across the affected fleet. Click into any family for the full reliability picture across every model that uses it.
Hyundai/Kia Theta II 2.4L
29,682 complaints 42 vehicle applications 1 critical recalls
Ford 5.4L Triton V8
16,252 complaints 60 vehicle applications 7 critical recalls
Honda J35 V6 with VCM
14,986 complaints 48 vehicle applications 10 critical recalls
Ford 1.6L EcoBoost
14,121 complaints 18 vehicle applications
Engine family selections are curated by ProblemsByVin editorial based on documented widespread defect patterns. Complaint and recall data sourced from NHTSA public records.