Sell the car and tell DH he can buy her a 2K beater car if he has no credit. Not your problem.

People can't walk all over you if you aren't lying on the ground.  You are allowing them to treat you this way.  Is there a way to do this without DH getting angry? Probably not.  But who cares?

If you will not take that bad of a beating on it.  Not a new car anymore, used car, normally lose a few thousand on that. But she should not drive it if can not make the payments 

She agreed to terms and reneged on the agreement.
Car is in your name.
Sell it and be done with it.
She can work out her own transportation solutions whilst lying in her room doing little productive.
 

Repo the car yourself and sell it. I don't even understand how this situation happened, to be completely honest with you. I cannot imagine myself financing a car for a skid, let alone an 18 year old skid whom you've described as essentially a sloth living in your house. 

Agreeing with all above who say sell the vehicle. I don't understand why any parent would buy a young kid or new driver a new car - and I don't care how much money they have. Much less, seeing how irresponsible she is and not holding up her end of the bargain.

Here (UK), one in 5 new drivers are involved in a smash in the first year of driving. One in four (26%) between 18-24 are involved in a car crash in their first four years of driving. Even though under 19yo are only 1.5% of licenced drivers on the road, they account for 9% of serious traffic accidents or  fatalities as drivers. There is no way in hell, I would give a young driver a new car based on this. 
My SS18 is driving my old car - it is 5 years old - but he pays (through his nose!) for the insurance and taxes. He pays for it - if he doesn't he will lose the car (my rule), and possibly his licence if he is pulled over for driving with no insurance (thanks to the traffic police).
I won't play games with him if thinks he can mess around with responsibilities he has agreed to.
 

Like most problems on this site, it's less about the SK than it is about the DH. Not a surprise that a grown man with bad enough credit that he needs you to buy the vehicle is raising a kid who is not financially responsible.  I think your big mistake was in being a part of the transaction and I hope that all payments she's missing are being covered by your DH and do not adversely affect your joint financial situation, though I highly doubt that. At this point, you need to stop avoiding conflict to your own detriment and confront the DH. I agree with tog redux... You are allowing people with highly questionable judgment to walk all over you. Time to put your foot down and do what's best for you and your credit.

Your own husband's credit is crap, he had no business asking you, and you should have never let him talk you into financing his daughter. Why did you allow it? Please learn from this. Repo the car.

Honestly, I don't know how you can have any respect for your husband. Forget about the fact that his daugher already had a vehicle to drive, but then he expected his wife to finance a new car for HIS daughter, because he couldn't. User.

Yep. No way I would have financed a car to begin with, but here you are. 

YOU shouldn't be worried about causing major problems by taking action on this VERY SERIOUS FINANCIAL MATTER. Your HUSBAND should be be worried that YOU ARE MAD. 

So now not only have your expenses increased, but your husband is making less.

Draw a hard fast line. She gets a job immediately and starts paying for the car and insurance or no more car. NO MORE. Your husband can take her to/from work or a friend or you don't care because it's not your problem. But it IS YOUR CAR. 

Hmmm DHs credit is bad so you finance the car. This should end well. When someone's credit is bad, there is a reason for that.

I can already hear my SD sceaming "but you gave it to me!" 

We are human. We make mistakes. We also have the right to change our mind and not feel guilty about it.

what kind of car did you buy yourself 3 months ago? I agree, sell your current car and take the new one. You’re paying for it, might as well enjoy it.

and the difference you lose out on from purchase price to finishing paying off the loan, daughter owes you back.

be very firm with this. When she is a sloth she should be made and told to get a job. Give a time limit she has a month to get a job or she is kicked out on the street. When the day comes and still no job, she is out and door locks changed so she cannot enter.

only then will she know you mean business.

no way i would sign up for a loan for skids, there is this saying never get into business with family, its a bad idea as always goes south then you’re up financially and the relationship is permanently damaged. If hubby told me his credit was bad i’d say tough shit

Remarriages (or any relationships involving children from a previous relationship) are very different from first marriages. In general, each person is responsible for their own baggage, including debt, child support, child rearing, etc. That whole Brady Bunch-we're a TEAM pap is nonsense. Your H has a kid - you don't, and are in no way obligated to support her, feed her, socialize her, or house her. But you've fallen into the stepparent trap of being too nice, and where has it gotten you?

In steplife, nice guys finish last. You have to be able to stand up for yourself, draw boundaries, and say NO and mean it. Your H has found a soft place for himself and his daughter, hasn't he? But rather than be grateful, he leveraged his relationship with YOU in order to give SD a car. Do you understand that? He prioritized spoiling his UNDESERVING slug of a daughter over your financial security. Chew on that as you open up a new browser to order a sleek pair of Bi!ch Boots.

I get it, not everyone is great with money. And it's actually a good thing this happened early in your marriage. The lesson is in front of you, so learn from this. Keep your finances separate, take care of YOU first, have your own financial plan, and never spend another dime on someone else's kid. Make your next blog a question about how ST members handle finances in blended families. You've learned an important lesson about your H - you cannot trust his judgement where his kid is concerned, and will always have to keep a close eye and your own counsel on the finances.

Once upon a time, I had a slug of a teen SD. I spent 5+ years raising her for my non-parent H. She finally got her driver's license at 18 after I resigned as chauffeur. Post high school, our arrangement was she could live with us rent free as long as she was enrolled in community college and working. I had an older convertable I let her use as long as she paid for her own insurance. She had it made, IMO.

I discovered that she had been forging payment receipts for auto insurance FOR MONTHS, putting me at risk for liability. Took the keys immediately, and donated the car to charity. I am the queen of my castle, as are you. So shake things up, and make your H toe the line if he wants to stay married to you. He is responsible for two-thirds of the household bills, PLUS the car payment, PLUS all expenses related to his daughter. Don't cover for or carry him.

Sit them both down and tell them if payment of all outstanding monies and the next payment of $X amount are not paid in full on the next payment then SS will not be driving the car.   That YOU will not or in the future support SD are she is an adult and as so she is responsible to cover her costs.  I would arrange for the car to be stored at a friends house so SD can't drive it.

And if your DH doesn't like it tell him to get a second job to pay for his 18 yr old ADULT daughter who is to lazy to get a full time job.

I would also change the Netflix password or even turn of the WIFI while your at work.

Ever since SS moved in there has been a vacuum cleaner sucking up my savings and spare $$$   it gets old fast.

OP and anyone else.

NEVER EVER co-sign a loan for anyone. I wouldn't sign for my own bios and I LOVE THEM to the moon and back.

It is one thing to gift $$ to them towards a down payment. Thats a gift. IF you have to co-sign it is because they cant afford it or their credit is shot. Do you really think the bank wont come after YOU because fee's fees are involved/

Co-signer of student loans, usually aging parents, are seeing garnishing all monies they can find for repayment of delinquent kids loans. DON'T Co sign ever.

OP if you peel back the layers here you co-signed to prove your nice. You thought it would prove to dh your wonderful and that he would appreciate you more.....so sorry this happened. DONT do it again.