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Home >> Chevrolet >> 2006 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 6.6L (LLY) - DTC P0016 To DTC P0342 >> DTC P0168 >> Circuit/System Testing

Circuit/System Testing

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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