NHTSA Complaint #11448783 — 2021 JEEP GLADIATOR

In January 2021, my 2021 Jeep Gladiator Overland became unstable at normal freeway speeds (60-75 mph) on many occasions. The slightest bump or surface irregularity stimulates a violent and sustaining side-to-side vehicle shudder/vibration from the front suspension that was very extreme that lasted for over 2 minutes or until the vehicle slowed to around 60 mph; where stable vehicle behavior restored. This extreme instability and needed hard braking creates a serious driving hazard. I have taken it to 2 separate dealers who cannot find any issue and are unwilling to investigate unless it happens in their presence even with video proof. I have also taken to a tire shop and had the tires re-balanced and put on a road force machine. The tire shop found no issues with the tires or balancing. This started at about 23,000 miles and occurs more as the temperatures drop. This failure mode is severe, occurs without warning, is not detectable until it occurs and is very frightening. My Jeep has stock, factory wheels and factory tires in good balance with no visible or abnormal tread wear. This is a dangerous condition that needs immediate correction. A 1 year old vehicle with 23,000 miles in excellent condition, no accident history and no modifications should not be doing this. Side note; I did have to have the engine replaced after 11 months of ownership and the Jeep came from the factory with cracked spark plugs and had the spark plugs replaced after 1 week of ownership. This is an ongoing issue with no resolution.