[Transmission] Berlingo Van Auto stuck in 1st gear

[Linda21]

Hello, I have a 2015 Berlingo van with an automatic transmission, it also has the option of driving it as a manual.   The other day the ABS warning light came on so I phoned the garage and booked in for them to take a look  next week. The guy I spoke with seemed to think it was probably just a problem with the sensor.  Today I went to the shops and it drove normally,  but when I went to come home the van wouldnt change up out of first gear while in auto. I switched the dial to M and drove home in manual mode without any issues. I wondered if anyone has any ideas what could possibly be wrong with my van please?  I had a trip out planned for tomorrow, but now I'm too worried that the van will break down and leave me stranded somewhere.  Thank you for any advice.