# NHTSA Defect Petition DP21004
> **Semi-Trailer Side Underride Guards** · Opened 2021-11-17 · Closed 2022-06-22
## Investigation
- **Action number:** DP21004
- **Type:** Defect Petition
- **Open date:** 2021-11-17
- **Close date:** 2022-06-22
- **Manufacturer:** Generic Manufacturer
- **Affected makes:** SEMI-TRAILER
- **Affected components:** STRUCTURE: UNDERRIDE
- **Affected model years:** 9999
- **Affected (make, year) variants:** 1
## Summary

See the attached evaluation report.

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=DP21004)
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