So it happened again that the engine would not rev up.
The parents made it home almost at coasting speed and parked in the driveway.
After a couple of hours we turned it on again to pull the codes and tried moving up and down the driveway.
It got into reverse fine and we pulled back a couple of feet.
Then we put into Drive but instead of doing it as normal, transmission made a giant ‘THUD’ and would not move forward even at 3000 RPM. Tried switching into reverse and it made another giant ‘THUD’.
At this point we shut off the engine and left the van alone.