Water in Fuel Indicator
Indicates the presence of water in the fuel system.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The truck’s computer is detecting moisture in the fuel. This can happen if there's water in the fuel tank due to contaminated fuel or condensation. Fuel systems generally want no more than 0.05% water content to function properly without causing issues.
What the computer is actually seeing
The Engine Control Module (ECM) uses input from the fuel quality sensor to measure the conductivity of the fuel. If it reads above a certain threshold (usually around 0.05% water), it sets this code.
What a healthy reading looks like
Expected conductivity readings should be below 30 µS/cm; anything above indicates water presence.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the fuel tank for water contamination; drain if necessary and replace with clean fuel.
- 22. Inspect fuel lines and connectors for leaks; repair any damaged areas.
- 33. Test the fuel quality sensor; it should output a conductivity below 30 µS/cm. If not, replace the sensor.
- 44. If water is not present but the code persists, consider inspecting the ECM for faults or poor connections.
Common causes
- Contaminated fuel from the tank
- Leaking fuel lines or tank
- Condensation in the fuel system
- Faulty fuel quality sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's better to address it soon to prevent fuel system damage, but limited driving may be possible if no other symptoms are present.
Will this code come back after clearing?
If the underlying issue isn't fixed (like water in fuel), it will likely reappear.
Why does this code show up with fuel system issues?
This code is triggered by moisture detection, which can negatively affect combustion and lead to misfires or stalling.
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