Faulty tailgate struts: The tailgate struts (also known as lift supports) are gas-filled cylinders that assist in lifting and holding the tailgate open. If the struts are worn out or damaged, they may not be able to provide enough force to keep the tailgate open, causing it to sag or fall closed. Replacing the faulty struts should resolve the issue.
Obstructed tailgate hinges: The tailgate hinges may be obstructed by dirt, debris, or corrosion, preventing them from moving smoothly and causing the tailgate to stay open. Cleaning and lubricating the hinges may resolve the problem.
Malfunctioning tailgate lock: The tailgate lock may be faulty or damaged, preventing it from engaging properly and keeping the tailgate closed. Repairing or replacing the tailgate lock should solve the problem.
Electrical issues: In some cases, electrical issues, such as faulty wiring or a malfunctioning switch, can prevent the tailgate from closing properly. Troubleshooting the electrical system and, if necessary, replacing any faulty components, should address the issue.
If you are unable to resolve the problem on your own, it is recommended to take your Volvo to an authorized Volvo service center for proper diagnosis and repair.
