P2266 — Water in Fuel Sensor A Circuit Low
The water-in-fuel sensor at the diesel fuel filter reads below lower plausibility — short to ground. The sensor warns the driver to drain the filter when condensate accumulates.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Water in fuel sensor
- Fuel filter
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Short to ground
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.