What Does P2266 Mean?
The water-in-fuel sensor circuit voltage is reading below the normal operating range. This indicates either a short to ground in the circuit or a sensor that is constantly detecting water presence.
Common Causes
30%
Shorted sensor wiring or connector pins creating a short to ground
28%
Failed water-in-fuel sensor internally shorted or grounded
22%
Water or moisture intrusion in sensor connector causing short circuit
15%
Actual heavy water contamination in fuel causing legitimate low voltage reading
5%
Damaged fuel filter housing causing sensor ground fault
Diagnostic Steps
1
Step 1: Disconnect water-in-fuel sensor and inspect connector for corrosion, moisture, or damaged pins
2
Step 2: Check for water accumulation in fuel filter bowl and drain if present
3
Step 3: Measure resistance between sensor signal wire and ground with sensor disconnected
4
Step 4: Test sensor resistance according to specifications with it removed from fuel system
5
Step 5: Check for chafed or pinched wiring between sensor and PCM causing intermittent short
Estimated Repair Cost
$90 - $380
Parts + labor, varies by vehicle and location
The water-in-fuel sensor circuit voltage is reading below the normal operating range. This indicates either a short to ground in the circuit or a sensor that is constantly detecting water presence.
The most common cause of P2266 (Water in Fuel Sensor Circuit Low) is: Shorted sensor wiring or connector pins creating a short to ground
Typical repair costs for P2266 range from $90 to $380, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive short distances. If actual water contamination is present, continued operation may damage fuel injection components requiring expensive repairs.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2266 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
