The tailgate strut may be covered under warranty, but it completely depends on what the manufacturer has agreed upon with the buyer. Most GM vehicles, for example, have a 3-year bumper-to-bumper coverage that includes anything on the vehicle, which fails due to a manufacturer defects, such as tailgate struts.
Most auto manufacturers will have their warranty information available online. Chevrolet's information can be seen on their website, which describes everything their warranty includes such as:
- Rust protection
- Power train protection
- Drive train protection
- Bumper-to-bumper protection
- Tire protection
If an issue arises on one of their vehicles still under warranty, the owner can take it to a respective service center and have the truck repaired.