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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 6.6L (LLY) - DTC P0401 To DTC P2510 >> DTC P2266 >> Circuit/System Testing

Circuit/System Testing

  1. Turn OFF the ignition and disconnect the water in fuel sensor.
  2. Turn ON the ignition and clear the DTC.
  3. Start and run the engine.
    • If this DTC resets, test the indictor control circuit for high resistance or a short to ground.
    • If the DTC does not reset, refer to Water-in-Fuel Lamp Always On .
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