This vehicle was brought in after being at another shop as usual. Code P0122 was stored for low TPS voltage. Checked the TPS and connector and all was okay. Strangely enough I did some online research and found a post of a similar problem and it related to a 4wd vehicle that had also had the transmission repaired several months earlier. I put the vehicle on the lift to see if it was this Blazer’s problem. Sure enough there was a shiny ring on the front drive shaft and just above it was a misrouted wiring harness.
I unhooked the harness connector above the transmission, repaired the damage and rerouted the harness to the factory retainers that were still in place on the crossmember.