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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 931 (Engine Controls And Fuel - 6.6L (LMM) - DTC P0016 To DTC P0299) >> DTC P0168 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Fuel temperature overheating may be cause by a fuel heater element that is stuck on. Refer to Fuel Heater Always On .
  1. With ignition ON and the engine OFF, observe the Fuel Temperature and ECT Temperature parameters with a scan tool.
    • If the temperatures do not closely match each other when the engine has cold soaked overnight, test for a skewed fuel temperature sensor. Refer to Component Testing  in the diagnostic.
  2. Inspect for debris or damage to the cooling fins of the fuel cooler.
    • If a damaged fuel cooler was found, repair or replace the cooler.
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