I've been having problems with codes that keep popping in spite of the fact that I have changed all the sensors, checked connections, wiring, grounds, etc...

Code DTC P0643 SENSOR POWER SUPPLY - ECM detects a voltage of power source for sensor is excessively low or high. When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up (the car goes limp and will not accelerate beyond 2000 RPM). ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.

This code pops as a result of several sensors not working as intended. The sensors affected are : Accelerator position pedal sensor (1 and 2), refrigerant pressure sensor, power steering position sensor, EVAP control system (pressure sensor, control valve). Evap purge control valve...

Has anyone heard about this ???.. Is there a way to override the fail safe mode ??