P0463 BUICK Fuel Level Sensor Circuit High Input

Possible causes
– 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).
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Incorrect fuel level reading
P0463 BUICK 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.
BUICK Technical Service Bulletins for P0463 code
2008 BUICK ALLURE FUEL SYSTEM, OTHER:STORAGE:FUEL GAUGE SYSTEM
2008 BUICK LACROSSE FUEL SYSTEM, OTHER:STORAGE:FUEL GAUGE SYSTEM
2009 BUICK ALLURE FUEL SYSTEM, OTHER:STORAGE:FUEL GAUGE SYSTEM
2009 BUICK LACROSSE FUEL SYSTEM, OTHER:STORAGE:FUEL GAUGE SYSTEM
2005 BUICK TERRAZA FUEL SYSTEM, OTHER:STORAGE:FUEL GAUGE SYSTEM
2006 BUICK TERRAZA FUEL SYSTEM, OTHER:STORAGE:FUEL GAUGE SYSTEM
2007 BUICK TERRAZA FUEL SYSTEM, OTHER:STORAGE:FUEL GAUGE SYSTEM