DTC P0463. GMC Truck Yukon XL

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2005 🢒 Yukon XL - 4WD 🢒 DTC 🢒 DTC P0463

Circuit Description

The fuel level sensor changes resistance in response to fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the sensor resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sensor resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The PCM sends the fuel level percentage via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0463 Fuel Level Sensor 1 Circuit High Voltage

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

•	The sender output is greater than 2.9 volts.

•	The above condition is present for greater than 30 seconds.

Action Taken When the DTC Sets

•	The fuel gage defaults to empty.

•	The low fuel indicator illuminates.

•	The PCM records the operating conditions at the time that the diagnostic test fails. The PCM displays the failure information in the Failure Records on the scan tool.

Conditions for Clearing the DTC

•	The DTC becomes history when the conditions for setting the DTC are no longer present.

•	The history DTC clears after 40 malfunction-free warm-up cycles.

•	The PCM receives the clear code command from the scan tool.

Diagnostic Aids

•

Use the Freeze Frame/Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame/Failure Records data may help in determining the number of miles since the DTC set. The Fail Counter and Pass Counter can also help in determining the number of ignition cycles that the diagnostic test reported a pass and/or fail. Operate the vehicle within the same Freeze Frame conditions, including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This will isolate at what point the DTC failed.

•	Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The number below refers to the step number on the diagnostic table.

This step tests for the proper operation of the circuit in the low voltage range.

Step

Action

Value(s)

Yes

Schematic Reference: Instrument Cluster Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, observe the Fuel Tank Level Remaining parameter in the powertrain control module (PCM) enhanced evaporative emission (EVAP) Data, data list.

Does the scan tool indicate that the Fuel Tank Level Remaining parameter is less than the specified value?

Go to Step 3

Go to Diagnostic Aids

Turn OFF the ignition.
Disconnect C152.
Connect a 3-amp fused jumper wire between the signal circuit of the fuel level sensor and the low reference circuit of the fuel level sensor on the male terminal side of the connector.
Turn ON the ignition, with the engine OFF.
With a scan tool, clear the DTCs.
With a scan tool, observe the Fuel Tank Level Remaining parameter.

Does the scan tool indicate that the Fuel Tank Level Remaining parameter is greater than the specified value?

98%

Go to Step 6

Go to Step 4

Test the signal circuit of the fuel level sensor for an open, for a high resistance, or for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.