# NHTSA Preliminary Evaluation PE99021
> **UPPER CONTROL ARM BALL JOINT BREAKAGE** · Opened 1999-03-05 · Closed 1999-07-30
## Investigation
- **Action number:** PE99021
- **Type:** Preliminary Evaluation
- **Open date:** 1999-03-05
- **Close date:** 1999-07-30
- **Manufacturer:** General Motors, LLC
- **Affected makes:** CHEVROLET; GMC
- **Affected components:** POWER TRAIN
- **Affected model years:** 1996
- **Affected (make, year) variants:** 2
## Summary

AN UPPER CONTROL ARM BALL JOINT FAILS, RESULTING IN THE FRONT SUSPENSION COLLAPSING ON THE FAILED SIDE.

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=PE99021)
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