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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1539 (Engine Cooling System - Non-Hybrid) >> Diagnostic Information and Procedures >> DTC P0480 or P0481 (without HP2) >> 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. Engine operating, observe the DTC information with a scan tool. DTC P0480 or P0481 should not be set.
  2. Command the cooling fans ON and OFF at high speed while observing the scan tool circuit test status parameters listed below:
    • FC Relay 1 Ckt Open, Short Gnd, and Short Volts Test Status
    • FC Relay 2 and 3 Ckt Open, Short Gnd, and Short Volts Test Status

      The parameters should display OK or Not Run in each of the commanded states.

  3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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