Water in Fuel Sensor Circuit Malfunction
The P2264 code indicates a problem with the water-in-fuel sensor circuit, typically found on diesel engines. This sensor detects water contamination in the fuel filter/water separator. The ECM monitors the sensor's voltage or resistance; when it falls outside the expected range, the code sets. Common causes include a faulty sensor, wiring issues, or contaminated fuel. If ignored, water can damage the fuel injection system.
01. Most Common Causes
- Faulty water-in-fuel sensor
- Open or shorted wiring in sensor circuit
- Corroded or loose connector
- Contaminated fuel with excessive water
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Water-in-fuel warning light on dashboard
- Engine may run rough or have reduced power
- Difficulty starting or stalling
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect the water-in-fuel sensor connector for corrosion or damage.
Step 3: Test sensor resistance/voltage per manufacturer specs.
Step 4: Check wiring for shorts or opens between sensor and ECM.
Step 5: Drain fuel filter/water separator and check for water contamination.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Water in fuel can cause severe damage to the injection system, leading to costly repairs. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, plus diagnostic time. If wiring repair is needed, costs may be higher.