Engineering Analysis

What It Means

An Engineering Analysis (EA) is the second formal stage of a NHTSA ODI defect investigation, designated with a case identifier in the format EAYY-NNN (for example, EA22-002). An EA is opened when a Preliminary Evaluation (PE) has produced enough evidence that a safety defect may exist and deeper engineering investigation is required. EAs take on average 12 to 18 months and involve much more intensive work than PEs: NHTSA engineers at the Vehicle Research and Test Center in East Liberty, Ohio purchase subject vehicles on the secondary market, perform component teardowns, conduct environmental and mechanical stress testing on suspect parts, simulate crashes using sled tests and full-vehicle barrier tests, and reconstruct real-world incident crashes using Event Data Recorder (EDR) downloads from complainant vehicles. Manufacturers are subject to far more extensive information requests during an EA, often producing tens of thousands of pages of engineering documents, internal emails, and field-failure analyses. At the conclusion of an EA, ODI engineers issue an Engineering Analysis Closing Report (public on nhtsa.gov) that either finds no defect (about 20 percent of EAs), closes because the manufacturer has issued a voluntary recall (about 65 percent), or recommends that the Administrator issue an Initial Decision of Defect and pursue a mandatory recall (rare, fewer than 5 percent). Major EAs that led directly to massive recalls include EA07-010 (Toyota floor mat entrapment, 2009), EA14-001 through EA15-xxx (Takata airbag inflator rupture, still ongoing in 2026), and EA22-002 (Tesla Autopilot crashes into emergency vehicles, escalated from PE21-020). RecallCheck flags active EAs affecting a vehicle with an "Active Investigation" banner on the vehicle page, because an open EA indicates NHTSA has advanced from preliminary concern to full engineering scrutiny.

Frequently Asked Questions