LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0016-P0401)) >> DTC P0168 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
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 .
  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.
scientia non olet · About LEMON Manuals