Your TPS “A” Circuit has an expected output voltage range, as does your TPS “B” Circuit (if so equipped). When code P0121 occurs, it means that your Engine Control Module (ECM) recognized that your throttle position “A” circuit's expected output voltage has either gone above or below the sensor's expected range.31 Aug 2018
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The EVC Throttle Controller does not automatically void your warranty, and we actually have many dealerships that sell our EVC Throttle Controller as an optional extra. The EVC Throttle Controller will only ever impact your warranty if it is deemed to have caused the issue that you are seeking warranty on.
At idle is should be zero or a couple of degrees. Press down on the gas pedal very S-L-O-W-L-Y until the throttle is all the way open. ... If the TPS has a worn spot, most likely it will be between 0 and 20 percent throttle opening. Try holding the throttle between 0 and 20 percent to see if you get a steady reading.