Water in Fuel Sensor Circuit Range/Performance
The P2264 code means the vehicle's onboard diagnostic system has detected: Water in Fuel Sensor Circuit Range/Performance. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $50 - $300 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- Water in fuel warning light
- Rough idle or stalling
- Hard starting especially in cold weather
- Reduced engine power
Probable Causes (Ranked by Likelihood)
- Actual water contamination in the fuel tank or fuel filter Very High
- Faulty water in fuel sensor High
- Corroded sensor connector Moderate
- Wiring issue in the sensor circuit Moderate
- Contaminated fuel filter housing Low
Step-by-Step Diagnostic Procedure
-
Drain the fuel filter water separator and check for water presence
-
Inspect the water in fuel sensor and connector for damage or corrosion
-
Test the sensor operation by applying and removing water from the sensor tip
-
Check the wiring from the sensor to the ECM for continuity
-
Replace the sensor if it does not respond correctly to water presence
Frequently Asked Questions
What does the water in fuel sensor do?
The water in fuel sensor detects water contamination in the fuel system, typically located in the fuel filter housing. Water in diesel fuel can cause serious damage to fuel injectors and the injection pump.
How does water get into the fuel?
Water enters fuel through condensation in the fuel tank, contaminated fuel from the gas station, a damaged fuel cap seal, or a cracked fuel tank.
Should I drain the water separator first?
Yes, always drain the fuel filter water separator first. If the water warning goes away after draining, the sensor was detecting actual water. If the code persists after draining, the sensor may be faulty.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P2264 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.