Vettel is far from the entrance to the Turn 3 quick turn after what Ferrari has described as a "mechanical problem".
The cause was not detailed, although images seen by Motorsport.com revealed that the left side of the front wing was in contact with the track while Vettel was escaping.
Vettel said that he did not know much more than everyone knows, when he was asked during Wednesday's break, what was causing the crash .
"At that feeling, there was a problem with the front left corner," he said. "From there, I could not have done anything to avoid the impact.
"I was no longer in control and I went more or less directly into the fences. [what happened].
"It would be a lot easier if there was a lot of run-off and the car did not hit anything after, because now, as you can imagine, it's pretty damaged because of the hit.
"We have to be very careful to understand what the problem is, and that's what everyone is watching here, on the track and at Maranello."
Ferrari divides the tasks of its pilots every day this week. Vettel must hand over the SF90 to Charles Leclerc for the rest of Wednesday's race.
However, the team did not anticipate a quick return to the track in the afternoon.
This means that Ferrari currently has only 40 laps on the board for the second day of the second test. He also lost mileage Tuesday due to the need to check the cooling system.
"We traveled a lot of kilometers last week, but the plan is still to complete your program, we would have more tricks on the board than 40 this morning," he said.
"It's not ideal and we're wasting time, but for the moment, it's important to understand exactly what happened.
"I hit the wall hard enough and I think the wall did its job, the car did its job.
"After the impact, the car was very damaged, which is why it is so difficult to rebuild what was happening before."
Vettel and Leclerc were very positive when the Ferrari test program started in Spain last week.
The four-time world champion said the fall does not hurt "we're always strong" and "the car feels good".
"We've been exploring a lot since day one and I think last week was very productive," said Vettel.
"Yesterday, we were able to recover some of the time lost on the track this morning, so I'm still optimistic about the car and its sensations."
Sebastian Vettel, Ferrari after being stopped on the track
Photo by: Jerry Andre / Sutton Images