P2068 is an OBD-II diagnostic trouble code indicating that the powertrain control module (PCM) has detected a high voltage condition in the Fuel Level Sensor B circuit. This typically means the fuel level sensor is reporting a fuel level that exceeds the expected range, often appearing as a full or over-full reading when the tank may not actually be full.
The fuel level sending unit inside the fuel tank has failed, causing it to report an erroneously high fuel level to the PCM.
Damaged, shorted, corroded, or loose wiring/connectors in the fuel level sensor circuit can cause a high voltage signal to be sent to the PCM.
In some vehicle designs, the instrument cluster processes fuel level signals and can fail, causing incorrect readings.
The fuel level sensor float mechanism may be stuck, damaged by contaminated fuel, or physically obstructed inside the tank.
Intermittent power or poor ground connections to the fuel level sensor circuit can cause erratic high voltage readings.
An internal fault in the PCM's fuel level sensor input circuit is possible but should be diagnosed only after all other causes are ruled out.
Yes, the vehicle can typically be driven, but you will have an inaccurate fuel gauge reading, making it difficult to know when you need to refuel. The check engine light will remain on until the issue is resolved.
Repair costs vary significantly by vehicle make and model. A fuel level sensor replacement typically costs $100-$400 for parts plus labor. Wiring repairs may cost less if damage is minor. Costs are dependent on the specific cause and your vehicle's design.
In some cases, a technician may suspect the PCM if all other components test normal. However, PCM failure for P2068 is extremely rare. The fuel level sensor, its wiring, or related circuits are the culprit in the vast majority of cases. Always verify other causes are properly diagnosed before accepting PCM replacement.
No. P2068 specifically refers to Fuel Level Sensor B Circuit High. P0461 indicates a fuel level sensor circuit range/performance problem, while P0462 indicates a low input. While related, they represent different circuit conditions and require different diagnostic approaches.