Tough question. I have worked in all fields of credit including mitigation. The atmosphere out there now is HORRIBLE for anyone trying to get auto, or mortgage. I'm in touch w/mortgage brokers, and they are screaming bloody murder, can't get anyone done in my location anyway, the southeast, without a 720. And often, wanting the old fashioned 20%down standard 80/20, doing 10% down, with high credit scores.
It might depend on where you live also. California, Nevada, Colorado, Florida, almost forget it.
As for the reason your score is so low I would guess it is because you don't have enough debt believe it, or not. The lender likes to see a couple of credit cards, couple of years old, older the better, well managed, and never late, maybe get some credit cards, wait a year, or two, till this mess is over, other solution is co-signer,,,,,,,,,w/very high score.
Mortgage mitigators are having trouble adjusting mortgages of a million dollars, not uncommon, the industry in a state of confusion, and flux.
There are parts of the country where the markets, are not so bad, I'm told Dallas-Fort Worth, Austin, Tx., parts of the Midwest. Other areas you would have problems with would probably be Ohio, and Michigan, horror stories galore, Detroit reporting a 25% H.S. graduation rate, high unemployment, Cleveland, another similar problem area.
For the most part word in the industry, without large downpayment, banks looking for 700's last few months.
Problems in auto loan industry also.