# NHTSA Preliminary Evaluation PE04080
> **STEERING KNUCKLE FRACTURE ** · Opened 2004-12-02 · Closed 2005-10-28
## Investigation
- **Action number:** PE04080
- **Type:** Preliminary Evaluation
- **Open date:** 2004-12-02
- **Close date:** 2005-10-28
- **Manufacturer:** General Motors, LLC
- **Affected makes:** HUMMER
- **Affected components:** STEERING:LINKAGES:TIE ROD ASSEMBLY; SUSPENSION:FRONT; SUSPENSION:FRONT:CONTROL ARM:LOWER BALL JOINT
- **Affected model years:** 2003, 2004
- **Affected (make, year) variants:** 6
## Summary

DURING THE PE, ODI INVESTIGATED THE HUMMER H2 FOR FRACTURES WHICH WERE OCCURRING AT THE FRONT STEERING KNUCKLE LOWER BOSS.WHEN THE KNUCKLE LOWER BOSS FRACTURES, THE LOWER BALL JOINT STUD IS RELEASED AND THE ENTIRE KNUCKLE AND WHEEL/TIRE ASSEMBLY SEPARATES FROM THE VEHICLE.ODI IS UPGRADING THIS INVESTIGATION TO GAIN A FULL TECHNICAL UNDERSTANDING OF THE FACTORS WHICH CONTRIBUTED TO THESE FAILURES.

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=PE04080)
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