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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> Water-in-Fuel Lamp Diagnosis >> Circuit/System Description

Circuit/System Description

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The water in fuel sensor has a ignition circuit, signal circuit, and a ground circuit. The Engine Control Module (ECM) monitors the signal circuit for a predetermined voltage. The ECM determines the amount of water in the fuel with a sensor located in the fuel filter assembly. When the water in the fuel is above an acceptable level, the ECM sends a request to the instrument panel cluster to illuminate the Water In Fuel lamp.

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