How do you fix odometer in Pontiac g6 when giving a wrong reading?

To fix an odometer in a Pontiac G6 that gives incorrect readings, you should first check the vehicle's speed sensor, as a malfunctioning sensor can lead to inaccurate readings. Inspect the wiring and connections for any damage or corrosion. If the sensor is functioning properly, consider resetting the vehicle's computer by disconnecting the battery for a few minutes. If issues persist, consulting a professional mechanic or using an OBD-II scanner for diagnostic trouble codes may be necessary.