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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling >> Diagnostic Information and Procedures >> DTC P0480 or P0481 >> Circuit/System Verification

Circuit/System Verification

  1. Verify with a scan tool that the ECM is not commanding fan relay activation.
  2. Ignition ON, command each relay ON and OFF with a scan tool. Feel or listen to verify that each relay turns ON and OFF with each command.
  3. 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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