Code 53 is no communication from steer manager. Unplug the components connected to the steer manager one at a time. If you can get the 53 to go away by unpluging a component you know which part is bad. If no luck you likely need a steer manager. Try taking the filter card off as well. I have had one cause the steer manager to not talk, remove it and all is well.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.