Tps unrealistic transition???

[khaoskrew]

Hi everyone, My brother's 2019 850 was 1/2 mile up the trail Friday and started lurching, bogging, and then died. started back up and idled fine, so limped back to the truck and brought it home. We took it apart, checked all the wiring, and can't find anything yet. The code is 51 10 P0120 - TPS Unrealistic Transition
Any thoughts or ideas would be lovely.
Thanks

 

[Duban44]

Essentially the same thing happened on my ‘17 Switch Back Assault 800. Looking to replace TPS sensor.