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DTC P0461-P0464, P2066, P2067, or P2068

DTC P0461-P0464, P2066, P2067, or P2068

Diagnostic Instructions


Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P0461

Fuel Level Sensor 1 Performance

DTC P0462

Fuel Level Sensor 1 Circuit Low Voltage

DTC P0463

Fuel Level Sensor 1 Circuit High Voltage

DTC P0464

Fuel Level Sensor Circuit Intermittent

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

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Fuel Level Sensor 1 Signal P0462 P0463 P0463 P0461
Fuel Level Sensor 2 Signal P2067 P2068 P2068 P2066
Low Reference - 1 P0463, P0464, P2068 P0461, P2066
1. Fuel Gauge Inoperative


Circuit/System Description

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.

Conditions for Running the DTC


The engine is running

The system voltage is between 11-16 V


Conditions for Setting the DTC


P0461 or P2066

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.

The above condition is present for about 300 seconds.



P0462 or P2067

The signal voltage is less than 0.25 V.

The above conditions must be met for 5 seconds.



P0463 or P2068

The signal voltage is greater than 4.7 V.

The above conditions must be met for 5 seconds.



P0464

The fuel level change is greater than 10%.

The above conditions must be met for 30 seconds.

DTC P0464 runs and fails 2 out of 3 test cycles.


Action Taken When the DTC Sets


P0461, P0462, P0463, P0464, P2066, P2067 and P2068 are Type B DTCs

The fuel gauge defaults to empty

The low fuel indicator illuminates


Conditions for Clearing the DTC


P0461, P0462, P0463, P0464, P2066, P2067 and P2068 are Type B DTCs

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.


Reference Information

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Instrument Cluster Description and Operation

Electrical Information Reference


Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. 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.

2. 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

3. If the fuel level gauge does not sweep, replace the P16 Instrument Cluster.

4. Command the All Indicators test ON and OFF with the scan tool, verify that the low fuel level indicator turns ON and OFF.

5. If the low fuel level indicator always stays on or always off, replace the P16 Instrument Cluster.


Circuit/System Testing


1. Ignition OFF, disconnect the harness connector at the appropriate fuel level sensor.

2. Test for less than 30 Ω at the low reference circuit terminal C.

3. If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace K20 Engine Control Module.

4. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal D and ground.

5. If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

6. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace K20 Engine Control Module.

7. If all circuits test normal, replace the appropriate fuel level sensor.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Primary Fuel Level Sensor Replacement

Secondary Fuel Tank Module Replacement

Control Module References for the ECM replacement, programming and setup