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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 187 (Instrument Panel System Displays & Gages) >> Diagnostic Information and Procedures >> DTC P2068 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the secondary fuel level sensor.
  2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, install a 3-amp fused jumper wire between the secondary signal circuit terminal C and the low reference circuit terminal B. Verify the scan tool Fuel Tank Level Remaining parameter display is greater than 98 percent.
    • If less than the specified range, test the secondary signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  4. If all circuits test normal, test or replace the secondary fuel level sensor.
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