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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1660 (Engine Control System & Fuel System - 6.6L (LMM) - DTC P02E8 To DTC P1247) >> DTC P040C or P040D >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, engine OFF, clear the DTCs.
  2. Observe the scan tool EGR cooler temperature Sensor 1 parameter. The reading should be within the normal range -32°C to +899°C (-25.6°F to +1650°F), depending on the current ambient temperature and the vehicle operating conditions.
  3. Engine running, observe the DTC information with a scan tool. DTCs P040C or P040D should not be 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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