When evaluating a domain that looks like a technical server address, the standard rules for business websites do not apply. This address is a data-handling endpoint for vehicle telematics associated with General Motors. It is not an e-commerce store or a company portal where you would typically look for contact details or privacy policies.
Most users land on sites like this by accident, often through logs or automated software outputs. If you are wondering if filg-eus2.dataplane.na-d3.vehicledata.gm.com is a scam, the answer is that it is simply not a site for visitors. The lack of content and the returned server errors confirm that this is part of the background infrastructure for connected cars. There is no reason for an individual to provide personal information or credentials to this address. If you are concerned about your vehicle's data, check your official account on the manufacturer's main website instead.