WARNING: This page is about a different car, the 2018 Nissan NV3500 HD, 2018 Nissan NV2500 HD, and 2018 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
Check exhaust pipes, muffler and mounting for improper attachment, leaks, cracks, damage or deterioration.
If anything is found, repair or replace damaged parts.