The tech thinks the VSS is OK because I still have Speedometer function. The truck was running fine then it made a very hard shift down to 2nd (I think), and the check engine light came on. It shows a code for VSS, I pulled the trans pan to see if the filter and pan had debris in them but they were clean as a whistle. I wiggled the wiring harness in the pan and after I buttoned it up the truck drove normally for about a week then the same failure occurred. I don't know if the tech checked everything on the DRAC but he did make sure it has power, unfortunately the dealership where he works chucked all their old service manuals, they told him he can get everything online now. He said replacing the DRAC was the next thing to try but he is not at all sure this is the problem. Is there an online diagnostic procedure to follow?
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