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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1051 (Engine Controls And Fuel - 6.6L - DTC P02E7 To DTC P0699) >> DTC P040F >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Determine the ambient temperature by using an accurate thermometer.
  1. If the ignition has been OFF for greater than 10 hours, determine which EGR temperature sensor is skewed by comparing EGR temperature Sensor 1 and 2 parameters to the ambient temperature with a scan tool. The readings should be within 11°C (20°F) of each other, and also the ambient temperature.
  2. Engine running, observe the scan tool EGR temperature Sensor 1 and 2 parameters. The readings should be between -39 to +400°C (-38 to +752°F), depending on the current ambient temperature and the vehicle operating conditions
  3. Engine running, observe the DTC information with a scan tool. DTC P040F should not set.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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