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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G3500, VAN CARGO, 4.8 VREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 10 (ENGINE CONTROL SYSTEM - 6.6L (LLY) - DTC P0016 TO DTC P0342)DTC P0117 OR P0118CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 V

Circuit/System Testing

2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 VSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.

P0117

  1. Disconnect the ECT sensor.
  2. Turn ON the ignition with the engine OFF.
  3. Observe the ECT sensor parameter with a scan tool.
    • If the ECT sensor parameter is more than 149°C (300°F), test the ECT signal circuit for a short to ground or a faulty ECM.
    • If the ECT sensor parameter is less than -39°C (-38°F), replace the ECT sensor.

P0118

  1. Disconnect the ECT sensor.
  2. Turn the ignition ON with the engine OFF.
  3. Measure the voltage between the ECT signal circuit and a good ground with a DMM.
    • If the voltage is more than 5 volts, test the ECT signal circuit for a short to voltage.
    • If the voltage is less than 4.9 volts, test the ECT signal circuit for an open or a faulty ECM.
  4. Measure the voltage between the ECT low reference circuit and the ECT signal circuit.
    • If the voltage is more than 5 volts, test the ECT low reference circuit for a short to voltage or a faulty ECM.
    • If the voltage is less than 4.9 volts, test the ECT low reference circuit for an open or a faulty ECM.
    • If the voltage is between 4.9-5 volts, test the ECT low reference circuit and the ECT signal circuit for high resistance.
  5. If the ECT sensor circuits test normal, replace the ECT sensor.
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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.