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Don't need one with the C7, it resets automatically.
From the Owner's Manual:
TPMS Sensor Matching Process — Auto Learn Function
Each TPMS sensor has a unique identification code. The identification code needs to be matched to a new tire/wheel position after rotating the tires or replacing one or more of the TPMS sensors. When a tire is installed, the vehicle must be stationary for about 20 minutes before the system recalculates. The following relearn process takes up to 10 minutes, driving at a minimum speed of 19 km/h (12 mph). A dash (-) or pressure value will display in the DIC.
Not needed. The C7 TPMS auto calibrate themselves if you move them around/swap wheels.
I rotated my tires side to side. Once done, I lowered the new LF tire to 24psi. I started the car and the monitor read LF 24. The car never moved. I then inflated the tire back to 30 psi. I started the car again and the monitor read LF 30. Again, the car never moved. Automatic!
I have owned three sets of the correct sensors, two sets auto-calibrated, one did not. See the procedure I wrote in the tech section you can do from the drivers seat, with no service tool, to force the calibration if the auto does not work.
I rotated my tires side to side. Once done, I lowered the new LF tire to 24psi. I started the car and the monitor read LF 24. The car never moved. I then inflated the tire back to 30 psi. I started the car again and the monitor read LF 30. Again, the car never moved. Automatic!
same here, put hoosiers on Friday night and when i started car next day the tpms were set.