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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G3500, VAN CARGO, 4.8 VREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALINSTRUMENT PANEL SYSTEM DISPLAYS, GAUGES AND CONSOLEDIAGNOSTIC INFORMATION AND PROCEDURESDTC P2068TEST DESCRIPTION
2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 V

Test Description

2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 VSECTION Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  This step tests for the proper operation of the circuit in the low voltage range.
DTC P2068

Step Action Values Yes No
Schematic Reference: Instrument Cluster Schematics 
Connector End View References: Instrument Panel, Gages, and Console Connector End Views , Powertrain Control Module (PCM) Connector End Views for the 4.3L engine, Powertrain Control Module (PCM) Connector End Views for the 4.8L, 5.3L, and 6.0L engine or Engine Control Module (ECM) Connector End Views or the 6.6L (LLY) engine
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe one of the following fuel level parameters:
    • Fuel Level Sensor Rear Tank parameter in the powertrain control module (PCM) Enhanced EVAP data list - gas only.
    • Fuel Level Sensor Rear Tank parameter in the PCM Fuel data list - 6.6L diesel only.
Does the scan tool indicate that the Fuel Level Sensor Rear Tank parameter is greater than the specified value?		 4.5 V Go to Step 3  Go to Diagnostic Aids
3 
  1. Turn OFF the ignition.
  2. Disconnect C101.
  3. Connect a 3-ampere fused jumper wire between the signal circuit of the secondary fuel level sensor and the low reference circuit of the secondary fuel level sensor on the female terminal side of the connector.
  4. Turn ON the ignition, with the engine OFF.
  5. With a scan tool, observe the Fuel Level Sensor Rear Tank parameter.
Does the scan tool indicate that the Fuel Level Sensor Rear Tank parameter is less than the specified value?		 0.5 V Go to Step 6  Go to Step 4 
4 Test the signal circuit of the secondary fuel level sensor for an open, for a high resistance, or for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 5 
5 Test the low reference circuit of the secondary fuel level sensor for an open, for a high resistance, or for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
6 Test the signal circuit of the secondary fuel level sensor for an open, for a high resistance, or for a short to voltage between C101 and the secondary fuel level sensor. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 7 
7 Test the low reference circuit of the secondary fuel level sensor for an open, for a high resistance, or for a short to voltage between C101 and the secondary fuel level sensor. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 8 
8 Inspect for poor connections at the harness connector of the secondary fuel level sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 10 
9 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
10 Replace the secondary fuel level sensor. Refer to the following procedures:
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 12  -
12
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.