DTC P0461-P0463, P2066, P2067, or P2068
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DTC P0461-P0463, P2066, P2067, or P2068
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DTC P0461
Fuel Level Sensor Performance
DTC P0462
Fuel Level Sensor Circuit Low Voltage
DTC P0463
Fuel Level Sensor Circuit High Voltage
DTC P2066
Fuel Level Sensor 2 Performance
DTC P2067
Fuel Level Sensor 2 Circuit Low Voltage
DTC P2068
Fuel Level Sensor 2 Circuit High Voltage
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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Fuel Level Sensor 1 Signal
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P0462
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P0463
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P0463
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P0461
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Fuel Level Sensor 2 Signal
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P2067
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P2068
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P2068
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P2066
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Low Reference
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-
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1
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P0463, P2068
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P0461, P2066
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1. Fuel Gauge Inoperative
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Circuit/System Description
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The primary fuel level sensor and the secondary fuel level sensor change resistance based on fuel level. The engine control module (ECM) monitors the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to determine the fuel level. When the fuel tank is full, the resistances of both fuel level sensors are low and the ECM senses a low signal voltage on both the signal circuits of the primary fuel level sensor and the secondary fuel level sensor. When the fuel tank is empty, the resistances of the fuel level sensors are high and the ECM senses a high signal voltage. The ECM uses the signal circuits of the primary fuel level sensor and the secondary fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via High Speed CAN-Bus to the body control module (BCM). The BCM then sends the fuel level percentage via Low Speed CAN-Bus to the instrument cluster in order to control the fuel gauge.
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Conditions for Running the DTC
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The system voltage is between 11-16 V.
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Conditions for Setting the DTC
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P0461 or P2066
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The ECM detects a difference between the fuel consumed by the engine and change of the fuel level signal of less than 1 L (0.26 gal) over a range of 30 L (7.92 gal) or 45.6% of the primary fuel tank.
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The above condition is present for about 300 s.
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P0462 or P2067
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The signal voltage is less than 0.25 V.
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The above conditions must be met for 5 s.
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P0463 or P2068
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The signal voltage is greater than 4.7 V.
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The above conditions must be met for 5 s.
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Action Taken When the DTC Sets
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DTCs P0461, P0462, P0463, P2066, P2067 and P2068 are Type B DTCs.
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The fuel gauge defaults to empty.
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The Low Fuel indicator illuminates.
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Conditions for Clearing the DTC
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DTCs P0461, P0462, P0463, P2066, P2067 and P2068 are Type B DTCs.
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The DTC becomes history when the condition for setting the DTC is no longer present.
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The history DTC clears after 40 malfunction-free warm-up cycles.
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The following engines have only one fuel level sensor
Schematic Reference
Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Instrument Cluster Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Ignition ON, observe the scan tool ECM - Fuel Level Sensor parameters. The reading should be between 0.5-3.5 V and vary with fuel level.
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2.
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Ignition ON, perform the Instrument Cluster Gauge Sweep test with the scan tool, verify that the fuel level gauge sweeps from its low to high position.
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3.
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If the fuel level gauge does not sweep, replace the P16 Instrument Cluster.
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4.
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Command the All Indicators test ON and OFF with the scan tool, verify that the low fuel level indicator turns ON and OFF.
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5.
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If the low fuel level indicator always stays on or always off, replace the P16 Instrument Cluster.
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1.
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Ignition OFF, disconnect the harness connector X2 at the K20 Engine Control Module.
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2.
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Ignition ON, test for less than 0.3 V between either the low reference circuit or signal circuit terminals listed below and ground.
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LBS or 2H0 - low reference circuit terminal 38 or signal circuit terminal 52
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LLU - low reference circuit terminal 7 or signal circuit terminal 80
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LDK, LAU or LBW - low reference circuit terminal 9 or signal circuit terminals 26 and 36
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LBY with F46 - low reference circuit terminal 25 or signal circuit terminals 8 and 23
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LBY without F46 - low reference circuit terminal 25 or signal circuit terminal 23
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3.
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If greater than the specified range, test both the low reference circuit and the signal circuit for a short to voltage. If the circuits test normal, test or replace the appropriate fuel level sensor.
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4.
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Ignition OFF, test for infinite resistance between either the low reference circuit or signal circuit terminals listed below and ground.
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LBS or 2H0 - low reference circuit terminal 38 or signal circuit terminal 52
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LLU - low reference circuit terminal 7 or signal circuit terminal 80
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LDK, LAU or LBW - low reference circuit terminal 9 or signal circuit terminals 26 and 36
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LBY with F46 - low reference circuit terminal 25 or signal circuit terminals 8 and 23
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LBY without F46 - low reference circuit terminal 25 or signal circuit terminal 23
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5.
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If less than the specified range, test both the low reference circuit and the signal circuit for an open/high resistance. If the circuits test normal, test or replace the appropriate fuel level sensor.
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6.
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Ignition OFF, test for 20-300 Ω between the signal circuit terminal listed below and the low reference circuit terminal listed below.
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LBS - low reference circuit terminal 38 and signal circuit terminal 52
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LLU - low reference circuit terminal 7 and signal circuit terminal 80
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LDK, LAU or LBW sensor 1 - low reference circuit terminal 9 and signal circuit terminal 26
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LDK, LAU or LBW sensor 2 - low reference circuit terminal 9 and signal circuit terminal 36
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LBY with F46 sensor 1 - low reference circuit terminal 25 and signal circuit terminal 23
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LBY with F46 sensor 2 - low reference circuit terminal 13 and signal circuit terminal 8
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LBY without F46 - low reference circuit terminal 25 and signal circuit terminal 23
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7.
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If not within the specified range, test both the signal circuit and the low reference circuit or an open/high resistance. If the circuits test normal, test or replace the appropriate fuel level sensor.
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8.
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If all circuits test normal, test or replace the K20 Engine Control Module.
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Static Test
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1.
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Ignition OFF, disconnect the harness connector at the appropriate fuel level sensor.
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2.
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Test for 40-250 Ω between the signal terminal 1 and the low reference terminal 2.
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3.
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If not within the specified range, replace the appropriate fuel level sensor.
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Dynamic Test
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1.
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Ignition OFF, disconnect the harness connector at the appropriate fuel level sensor.
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2.
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Remove the appropriate fuel level sensor from the fuel tank.
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3.
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Sweep the sensor through the entire range while monitoring the resistance between the signal terminal 1 and the low reference terminal 2. The resistance should vary between less than 45 Ω and greater than 250 Ω without any spikes or dropouts.
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4.
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If not within the specified range or is erratic, replace the appropriate fuel level sensor.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
