Investigations
Semi-Trailer Side Underride Guards
NHTSA Defect Petition DP21004 — closed, opened 2021-11-17.
NHTSA investigation DP21004 is a Defect Petition opened on 2021-11-17 and currently closed. The subject is tracked inside the Office of Defects Investigation queue. Latest activity on this investigation was logged on 2022-06-22 — NHTSA updates that field whenever an Information Request goes out, a supplement is filed, or a status change is recorded in the public docket.
A Defect Petition like DP21004 starts when a person or group formally asks NHTSA to investigate a specific alleged defect. Petitioners submit evidence, NHTSA reviews it within 120 days, and either grants the petition (opening a PE) or denies it with a written explanation in the Federal Register.
Investigators summarized the matter as follows: "See the attached evaluation report...." Investigations are the early-warning layer of the federal auto-safety system, sitting upstream of formal recalls and defect orders. Whether this one closes without action or escalates into an Engineering Analysis, the full history stays in the ODI archive so researchers, litigators, and buyers can pull the paper trail at any time.
Investigation Summary
See the attached evaluation report.
About This Investigation Type
A Defect Petition (DP) is initiated when an individual or organization formally petitions NHTSA to investigate a potential safety defect. NHTSA reviews the petition and decides whether to open an investigation.
Data from NHTSA Office of Defects Investigation. Cross-references: NHTSA recall campaign API and NHTSA FARS where fatality records overlap. PlainCars does not rate or recommend vehicles. Learn more.
Read our methodology — how this data is sourced, computed, and verified.