P0463 GMC - Fuel Level Sensor Circuit High Input
- Faulty fuel level sensor
- Fuel level sensor harness is open or shorted
- Fuel level sensor circuit poor electrical connection
When is the code detected?
An excessively high voltage is sent from the sensor is sent to Engine Control Module (ECM).
- Engine Light ON (or Service Engine Soon Warning Light)
- Incorrect fuel level reading
P0463 GMC Description
The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor cord. The position of the float arm indicates the fuel level. The fuel level sensor contains a variable resistor, which changes resistance in correspondence to the amount of fuel in the fuel tank. The Engine Control Module (ECM) sends the fuel level information via the class 2 circuit to the instrument panel (I/P) cluster. This information is used for the I/P fuel gage and the low fuel warning indicator, if applicable. The ECM also monitors the fuel level input for various diagnostics.
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GMC Technical Service Bulletins for P0463 code
2007 GMC SIERRA 1500 Digital Instrument Panel Details
2007 GMC SIERRA 2500 Digital Instrument Panel Details
2007 GMC SIERRA 3500 Digital Instrument Panel Details
2008 GMC SIERRA Digital Instrument Panel Details
2007 GMC SIERRA 1500 117000 Digital Instrument Panel Details
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