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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1385 (Engine Controls And Fuel - 6.6L - DTC P1448 To DTC P2510) >> DTC P154D >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Observe the following with a scan tool.

  1. The IAH Temp CKT Status parameter should display OK.
  2. The IAH can be commanded ON with a scan tool.
  3. Engine running, observe the DTC information with a scan tool. DTC P154D 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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