Throttle position sensor open or shorted.
Note: Does not applies to E-Throttle vehicles.
Check wiring. All TPS sensors are three wired, one pin to Sensor GND, the second to +5v power supply and the third to TPS (CMC1: G2) analog input of MaxxECU.
Without no sensor connected, the TPS input voltage should be ~0v.
Please contact support if problem persist.