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Water-in-Fuel Lamp Diagnosis

Water-in-Fuel Lamp Diagnosis

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


Circuit/System Description

Ignition 1 voltage is supplied directly to the water in fuel lamp. The engine control module (ECM) turns the water in fuel lamp ON by sending a request to the instrument panel cluster via the CAN communication circuit. The ECM monitors 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 illuminate the water in fuel lamp.

Reference Information

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Instrument Cluster Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References

Circuit/System Verification


1. Ignition ON, observe the DTC information with a scan tool. Verify that DTC U0140 is not set.

2. If the DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle

3. Command the All Indicators test ON and OFF with a scan tool, verify that the water in fuel indicator changes between turn ON and OFF.

4. If the water in fuel indicator always stays on or always off, replace the P16 Instrument Cluster.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Water-in-Fuel Draining

• Control Module References