The truck was operating fine, then I came in the next morning at it was tagged out. I am the only resident tech that works at this location, so it has not been messed with. Is it possible that the resistance through the shunt that the traction card is seeing is low or has an open circuit. I read in an old post that someone else had an issue with resistance in the A2 cable I think it was? The operator had told me also that the brake was stuck engaged and would not release.