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Home >> GMC >> 2002 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 6.5L >> Diagnostic Information and Procedures >> DTC P0118 >> Test Description

Test Description

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

  1. 2. This step determines if DTC P0118 is a hard failure or an intermittent condition.
  2. 3. This step will determine if there is a wiring problem or a malfunctioning PCM.
  3. 9. This step determines if there is a short to voltage on the signal circuit. A short to voltage increases current flow through the sensor which overwhelms the sensor. This does not allow the sensor to pull down the circuit to the correct voltage and thus display the correct temperature.
  4. 10. After repairing the short to voltage, check the sensor for proper operation.
Fig 1: DTC P0118 (Steps 1-2)
G01599735Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P0118 (Steps 3-15)
G01599736Courtesy of GENERAL MOTORS CORP.
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