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That is a battery voltage low to ECU code.
I suggest having a shop look at the power lined going to the transmission controller on this. One of them is rubbed through and causing the shift issues to happen. You can operate the bus for now, but if the wire burns all the way through, it will leave you stranded. I suggest setting a down time for the bus for it to be checked out as soon as you can. You don;t want to have a load of passengers and be stranded somewhere.
Before taking it in, check the fuses at the battery box and make sure all the connections are good and tight as well there. If they are all good, then get it to the shop. A loose connection at the batteries can cause this.
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