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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1097 (Instrument Panel System Displays & Gages) >> Diagnostic Information and Procedures >> DTC P2068 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  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 D 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 3A fused jumper between the secondary fuel level sensor signal circuit terminal A and the low reference circuit terminal D. Verify the scan tool Fuel Tank Level Remaining parameter is greater than 98 percent.
    • If less than the specified range, test the 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, perform the fuel level sensor component test before replacing the secondary fuel level sensor.
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