The primary problem is a seat belt anchor that might not be properly fastened. Even though Tesla hasn't received reports of any related injuries, an improperly anchored seat belt could weaken the component's performance if there's a crash.
Interestingly, Tesla announced a recall for 24,064 Model 3s due to an issue with the car's servicing rather than its manufacturing. "Servicing certain components in Model 3 vehicles requires disassembly of the second-row left seat belt buckle and center seat belt anchor, both of which are fastened with the same bolt. Both components may have been incorrectly reassembled after disassembly during a service action," it said in the filing.
According to Tesla, if customers or service technicians notice that the second-row left belt or anchor is loose when pulled up and away from the bench, there may be an issue. In fact, complaints from these groups are what first alerted Tesla to the problem.
The good news is that the fix is fairly simple. According to the notice, Tesla will investigate the reassembly of left seat belt buckle and center seat belt anchor in the second row. If needed, they will fix it so that it meets original specifications. This service is provided without charge.
If you've already fixed the problem, don't worry, you'll be reimbursed for associated costs. For those of you who haven't received a notice yet, most owners will get an alert on their infotainment system regarding the recall.
Source: Carscoops