Is there is anything I can do now to stop the garnishment until after they sell the vehicle?

A creditor (except the government) can't garnish your wages until they have a judgment against you. Once they have a judgment, there are only two ways to stop a garnishment.One, work out a deal with the creditor to take a payment instead of garnishing your wages - usually this would involve making a lump sum payment. Two, file bankruptcy. Bankruptcy stops all garnishments.

I am unsure of what happened to allow them to garnish your paycheck. Did you get sued and they obtained a judgment? The only way to stop a garnishment is to get the creditor to agree or to file bankruptcy. The garnishment will continue until the debt is paid off until one of those things occur.

Without your taking additional steps, the creditor can keep up the garnishment, but nothing forces them to do so. You could call up their collections people and ask them to hold off. A bankruptcy stops the garnishment in its tracks and will usually discharge their claim, and almost all other debts. You might want to consider that step if you have a number of troublesome debts. (BTW, they could not get a garnishment unless they had already sued you first. Did they serve a complaint on you? Did you have an opportunity to respond? If they never served you, you could move to reopen the case.)

The fact that your wages are being garnished indicated that you were sued and that there is a court judgment against you. Probably this judgment has been around for awhile, and if it has existed for more than 6 months, there is little or nothing you can do in court about it. May be worth considering settling this debt for a lump sum of cash or if the amount of this debt and your other debts is large, looking to bankruptcy for help.