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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1042 (Engine Controls And Fuel - 6.6L - Troubleshooting & Diagnosis) >> Fuel Heater Always On >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Check the Water in Fuel lamp for proper operation. Refer to Water-in-Fuel Lamp Always On .

  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the fuel heater connector.
  3. With the fuel temperature above 21°C (70°F), test for continuity between the ignition 1 voltage terminal and the fuel filter/heater element housing.
    • If continuity was present, the thermostatic switch is stuck ON. Replace the fuel heater element.
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