What is the cause for your van to make a loud bumping noise when you turn?

A loud bumping noise when turning could be caused by several issues, such as worn-out suspension components, like struts or control arms, which may not absorb impacts effectively. It could also indicate a problem with the CV joints or axle, especially if the noise occurs during sharp turns. Additionally, loose or damaged exhaust parts or a failing wheel bearing might contribute to the noise. It's best to have a mechanic inspect the vehicle to pinpoint the exact cause.