What criteria needs to be met to obtain a no position letter to purchase a vehicle?

I would need to have some context to answer your question. Are you currently in an active bankruptcy? If so, what chapter and how long has your case been active? These details do make a difference in how you would proceed.

Some Chapter 13 trustees have well defined criteria that are posted on their websites but most review the debtors' proposals on a case by case basis. Generally speaking, if the new payment is roughly equal to or less than the payment on the old car and the interest rate isn't exorbitant (more than 15% isn't going to be acceptable) - the trustee will approve it.

A no position letter is used in some jurisdictions, but not in Nebraska. If you need to borrow funds for the purchase or lease of a vehicle, the Court must grant a motion to borrow funds. The motion must show that it is reasonable and necessary for your to borrow funds, and that you have the ability to repay the loan.