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For anyone following along or for the future. My issue was a failed wire in the small extension that comes off of the temp sensor and connects to the wiring harness. Its a small section, about 6-8 inches with plugs on either end. This corrected every issue on the truck. All transmission codes, CEL, temp gauge, etc, went away. Starts perfectly, runs great.
For anyone needing the part number which was very hard to locate, its this:YSB500480
