P0462

Wiring Diagram:

Fuel Level Sensor Circuit Low Voltage:

P0462- FUEL LEVEL SENSOR CIRCUIT LOW VOLTAGE
The fuel level sensor is variable resistor that varies resistance according to changes in the level of fuel in the fuel tank. The ECM supplies a 5 volt reference through a pull-up resistor to the sensor, which is connected to ground. When the level of fuel in the fuel tank is high, the sensor resistance is low (low voltage on signal line). As the fuel level decreases, the sensor resistance increases (higher voltage on signal line). The ECM monitors the fuel level sensor signal voltage to determine fuel tank level. The ECM will send this fuel level information over the controller area network (CAN) link to the BCM. The BCM in turn will average this information with respect to vehicle speed, then send it over the Class II link to the I/P cluster who will position the fuel gauge. DTC P0462 will set if the fuel tank level sensor signal voltage at the ECM is below the calibrated voltage value.

DTC PARAMETERS
DTC P0462 will set it if fuel level sensor signal voltage is less than 0.35 volts when.
^ Condition exists for longer than 5 seconds
^ Ignition is On

DTC P0462 diagnostic runs continuously with ignition On.

P0462 is a type D DTC

DIAGNOSTIC AIDS

NOTE: FUEL LEVEL SENSOR voltage on Scan tool is instantaneous, NOT averaged.

To locate an intermittent problem, use Scan tool to monitor FUEL LEVEL SENSOR with ignition On, engine Off. Wiggling wires while watching for a change in FUEL LEVEL SENSOR voltage may locate the area where a short to ground in the wiring may exist

If DTC P0462 is active, the Fuel gauge will take around 15 seconds to go to empty as long as no vehicle speed is present with the transmission in Park. If these conditions are not met, the fuel gauge may take a long time to reach empty.

The Low Fuel telltale will NOT be commanded On if DTC P0462 is active.

Fuel level sensor resistance range: 19 ohms with float at top position (full tank) through 251 ohms with float at bottom position (empty tank).