What NHTSA Investigations Mean for Your Safety
Published October 20, 2024 · Reviewed and corrected July 26, 2026
When you see that NHTSA has opened an investigation into a vehicle, it can be concerning. But not all investigations lead to recalls, and understanding the process helps you make informed decisions.
The Investigation Process
Defect investigations are run by NHTSA’s Office of Defects Investigation (ODI). The two-letter prefix on an investigation number tells you what kind of proceeding it is — and, in the case of PE and EA, how far it has escalated. They are not simply three sequential steps, which is how they are usually described.
Defect Petition — an entry point, not a stage
Anyone can petition NHTSA to investigate a suspected defect under 49 U.S.C. §30162. NHTSA must review the petition and either grant it — which opens an investigation — or deny it and publish its reasons in the Federal Register. A DP therefore comes before an investigation; it is not an escalation above one.
Preliminary Evaluation
The first investigative stage. ODI reviews complaint data, warranty and field reports, and the manufacturer’s written response to an information request. A PE can close with no action, close because the manufacturer launches a recall while it is open, or be upgraded to an Engineering Analysis.
Engineering Analysis
The escalated stage, and the one worth paying attention to. ODI engineers examine the failure mechanism in detail, usually with additional manufacturer data, field inspections and sometimes its own testing. An EA is the step that precedes a formal defect determination, so an upgrade from PE to EA is a meaningful signal.
Recall Query and Audit Query
These examine a recall that already exists rather than a new defect. An RQ asks whether a recall’s scope or remedy was adequate — for instance whether it covered enough model years, or whether the repair actually works. An AQ audits how a recall is being carried out. If you see one against a vehicle you own, it usually means the original fix is in question.
What Should You Do?
An open investigation is not a finding of fault, and it is not a recall. It means NHTSA thinks a complaint pattern is worth examining. Plenty of investigations close without one.
The useful response is to read the investigation summary and check whether the described symptom matches anything your vehicle actually does. If it does, report it — owner complaints are the primary input ODI works from, so a filed report at nhtsa.gov carries more weight than a forum post. If a recall does follow, book it straight away.
Open vs Closed Investigations
An open investigation means NHTSA is still examining the issue. A closed one means the review has finished — but “closed” carries no single meaning. It may have closed because a recall was issued, because the manufacturer acted voluntarily, because ODI found no defect trend, or because it was upgraded and superseded by a new investigation number. The closing resolution, not the status, is what tells you the outcome.
One caveat about our own data: the investigation records on this site are a dated snapshot of NHTSA’s database, not a live feed. For the current status of a specific investigation, check NHTSA directly.
Check investigation status for any vehicle
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·Editorial teamWe do not test cars or employ mechanics. What we do is read the public government record — NHTSA recall campaigns, complaints and investigations, and EPA fuel economy filings — and write it down in plain English with the source attached, so you can check us.
Last updated: July 26, 2026