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Circuit/System Description The primary fuel level sender and the secondary fuel level sender changes resistance based on fuel Conditions for Running the DTC The ignition is ON, with the engine running. The system voltage is between 11-18 volts. Conditions for Setting the DTC The secondary sender output is less than 0.5 volt. 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 ECM records the operating conditions at the time that the diagnostic test fails. The Conditions for Clearing the DTC Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance Fuel Level Sensor Signal P2067 1 P2068 P2068 P2066 Fuel Level Sensor Low - 1 P2068 P2068 P2066 1. Fuel Gage Inaccurate or Inoperative
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 Scan Tool Reference Control Module References for Scan Tool Information Circuit/System Verification Ignition ON, verify the scan tool Fuel Tank Level Remaining parameter is between 4-98 percent. Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the secondary fuel level sensor. 2. Ignition ON, verify that the scan tool Fuel Tank Level Remaining parameter display is less than 4 percent. If greater than the specified value, test the secondary signal circuit terminal C for a 3. If all circuits test normal, test or replace the secondary fuel level sensor.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Component Testing 1. Ignition OFF, remove the secondary fuel level sender. 2. While sweeping the fuel level sensor through its full range of motion, test for a minimum resistance value of less than 41 ohms and a maximum value greater than 119 ohms between If not within the specified range, replace the secondary fuel level sensor. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Fuel Level Sensor Replacement (Extended Cab w/26 Gal Tank) or Fuel Level Sensor Fuel Level Sensor Replacement (15 Reg Cab w/26 gal Tank) or Fuel Level Sensor Fuel Level Sensor Replacement (Cab/Chassis - Rear Tank) for the 6.6L engine Control Module References for ECM replacement, setup, and programming DTC 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 Descriptor DTC P2068 Fuel Level Sensor 2 High Voltage Diagnostic Fault Information Short to High Short to Signal
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Circuit/System Description The primary fuel level sender and the secondary fuel level sender changes resistance based on fuel Conditions for Running the DTC The ignition is ON, with the engine running. The system voltage is between 9-16 volts. Conditions for Setting the DTC The secondary sensor output is greater than 3.5 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 ECM records the operating conditions at the time that the diagnostic test fails. The Conditions for Clearing the DTC The DTC becomes history when the conditions for setting the DTC are no longer present. Circuit Ground Resistance Open Voltage Performance Fuel Level Sensor Signal P2067 1 P2068 P2068 P2066 Fuel Level Sensor Low - 1 P2068 P2068 P2066 1. Fuel Gage Inaccurate or Inoperative
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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