P2066
DTC P0461-P0464, P2066, P2067, or P2068
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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/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 Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left Front
Description and Operation
Instrument Cluster Description and Operation Instrument Cluster
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning 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. Observe the scan tool Instrument Cluster Fuel Level Sensor parameter. The reading should be 0-100 percent and vary with fuel level.
• If the reading does not vary with fuel level, refer to Circuit/System Testing.
3. Command the All Indicators test ON and OFF with the scan tool, verify that the low fuel level indicator turns ON and OFF.
• 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 ohms at the low reference circuit terminal 3.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
3. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 4 and ground.
• 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.
• 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 the K20 Engine Control Module.
4. If all circuits test normal, replace the appropriate fuel level sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Primary Fuel Level Sensor Replacement Primary Fuel Level Sensor Replacement for LF1 or LFW
* Primary Fuel Level Sensor Replacement Primary Fuel Level Sensor Replacement for LAF
* Fuel Tank Fuel Pump Module Replacement - Secondary (With Out) Fuel Tank Fuel Pump Module Replacement - Secondary (With Out) for LF1 and LFW
* Fuel Tank Fuel Pump Module Replacement - Secondary (With Out) Fuel Tank Fuel Pump Module Replacement - Secondary (With Out) for LAF
* Control Module References Programming and Relearning for the ECM replacement, programming and setup