Truck was pulling into a trailer, and when the operator attempted to plug to slow down, it threw a code 2M and coasted to a stop. Then when they towed it off the trailer, the brakes were locked up.

Now I have 2M on the display, and no functions, Hydraulic or travel. can someone point me in the right direction of what this code means.

I also went through to test outputs and noticed my TPC contactor will not energize. I put my meter on it, and it does not seem to be getting power. And now the buttons to operate the display start acting up when I attempt to manually actuate the TPC through the display's "Test outputs" feature.