What are the common causes of P238E?

An intermittent open or short in the water in fuel sensor B circuit. Water or corrosion in the water in fuel sensor B connector. A failing water in fuel sensor B element. A loose water in fuel sensor B connector.

Read water in fuel sensor B on a scan tool while wiggling the harness. Inspect the water in fuel sensor B connector for water or corrosion. Drain the fuel filter bowl and recheck. Test the water in fuel sensor B circuit for an intermittent fault. Replace water in fuel sensor B if the circuit tests good. Clear the code and retest.

P238E

Water in Fuel Sensor B Circuit Intermittent

System: Ignition and misfire (P code)
Lamp: Check Engine Light
Category: Powertrain - Ignition

What it means

P238E means Water in Fuel Sensor B Circuit Intermittent.

Where it lives

For P238E, the circuit described runs through the sensor. The description of P238E reports a fault at the sensor.

Check these first

An intermittent open or short in the water in fuel sensor B circuit
Water or corrosion in the water in fuel sensor B connector
A failing water in fuel sensor B element
A loose water in fuel sensor B connector

What to do next

Read water in fuel sensor B on a scan tool while wiggling the harness
Inspect the water in fuel sensor B connector for water or corrosion
Drain the fuel filter bowl and recheck
Test the water in fuel sensor B circuit for an intermittent fault
Replace water in fuel sensor B if the circuit tests good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.