This DTC is a generic transmission code, indicating that it is applicable to OBDII-enabled vehicles. Although it generally follows particular repair steps, it can also differ depending on the brand or model of your car. But we’ll talk about that later, for now, let’s focus on understanding how it works.
The Fuel Level Sensor (FLS), is placed in the fuel tank, generally an integral part of the fuel pump module. It usually is not replaceable without changing the fuel pump module, although there are some exceptions. Connected to the tank arm is a floater that moves over a resistor that is either grounded to the tank. The voltage is supplied to the sensor and the path to the ground, which shifts as the fuel level increases. The voltage quantity will vary depending on the system, but 5 volts is not unusual.
When the fuel level changes, the float moves the arm, and the resistor switches to the ground, resulting in a variation of the voltage signal. Depending on the system, this signal may be transmitted to a control module or directly to the instrument cluster. If the fuel level signal being sent to the PCM (Powertrain Control Module) is above 5 volts for a certain amount of time, DTC P2068 OBD2 is set. Check with your vehicle’s information source for the FLS Sensor “B” circuit.