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Circuit/System Description The fuel level sensor changes resistance in response to the fuel level. The engine control module 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 Circuit Ground Resistance Open Voltage Performance Fuel Level Sensor Signal P0462 1 P0463, P0464 P0463 P0461 Fuel Level Sensor Low - 1 P0463, P0464 P0463 P0461 1. Fuel Gage Inaccurate or Inoperative
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Scan Tool Reference Control Module References for scan tool information Circuit/System Verification Ignition ON, verify DTC P0461, P0462, P0463, or P0464 is not set If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle . Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the fuel level sensor. 2. Ignition OFF, test for less than 1.0 ohm between the fuel level sensor low reference circuit terminal B and ground. If greater than the specified range, test the low reference circuit for an open/high 3. Install a Signal Generator and Instrument Panel Tester between the signal circuit terminal C and ground. 4. Ignition ON, vary the signal generator resistance between 40-250 ohms. Verify that the scan tool Fuel Tank Level Remaining parameter displays a range that varies between 5 and 95 If not within the specified range, test the signal circuit for an open/high resistance. If 5. Vary the signal generator resistance between 40-250 ohms. Verify that the fuel gage displays a range that varies between empty and full as the signal generator resistance If the gage is incorrect, replace the IPC. 6. If all circuits test normal, perform the fuel level sensor component test before replacing the fuel level sensor. Component Testing 1. Ignition OFF, remove the fuel level sender. 2. While sweeping the fuel level sensor through its full range of motion, test for a minimum value less than 41 ohms and a maximum value greater than 119 ohms between the signal If not within the specified range, replace the fuel level sensor. Repair Procedures
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 the ECM or IPC replacement, setup, and programming FUEL GAGE INACCURATE OR INOPERATIVE (DUAL TANK) 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. Diagnostic Fault Information Circuit/System Description The fuel level sensor changes resistance in response to the fuel level. The engine control module Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance Fuel Level Sensor Signal P0462, P2067 1 P0463, P2068 P0463, P2068 P0461, P2066 Fuel Level Sensor Low - 1 P0463, P2068 P0463, P2068 P0461, 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
ECM senses a high signal voltage. The ECM uses the signal circuits of the primary and secondary 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 DTC P0461, P0462, P0463, P0464, P2066, P2067, or P2068 is not set If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle . Circuit/System Testing 1. Ignition OFF, disconnect the harness connector at the primary and secondary fuel level sensors.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Displays and Gages - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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