2007 model EASIOPC30TT, the truck tracks nice and straight either on the wire or off when traveling tractor first. As soon as we try to back up, the drive unit turns approximately 10 degrees and the truck will track to the left. No codes unless you are on the wire when this happens, and then those are just 9 series codes from losing the wire. I swapped the steer amplifier, no change, and the steering is centering itself perfectly on start-up. There is no play in the drive unit, and this happens at any steer position, even with the drive tire off the ground. I am thinking that I ran into this on another truck 15 or so years ago but I did not keep any notes on what solved the problem. Suggestions?
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