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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Displays And Gauges) >> Diagnostic Information and Procedures >> Water in Fuel Indicator Malfunction >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

If there is water in the fuel system, the water in fuel sensor/switch will close and produce a low voltage on the signal circuit. When the engine control module (ECM) detects a low signal voltage from the water in fuel sensor, the ECM will send a serial data message to the instrument panel cluster (IPC). The IPC displays the WATER IN FUEL SERVICE REQUIRED message in the driver information center (DIC) when the IPC receives a serial data message from the ECM.

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