P2266 code meaning
Water in Fuel Sensor A Circuit Low
What P2266 means
P2266 is set when the signal line of water-in-fuel sensor A stays below its valid range, typical of a grounded signal wire or of a conductive path that should not be there. Ford documents the code on 2017 and 2018 Super Duty trucks with the 6.7L diesel built up to 15 March 2018: bulletin 18-2133 links P2266, P2269 and P1140 with a lit water-in-fuel lamp to water entering connector C3080 at the sensor, which sits between tank and frame rail. The procedure checks the sensor across pins 1 and 2 for 795 to 815 kOhm, replaces it if out of range, then dries and wraps the connector. As water itself conducts, a wet plug can fake both a low circuit and a water alarm. P2267 is the high side, P2264 the general circuit code.
P2266 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2266
- Water-in-fuel lamp on although no water is in the separator
- Often stored together with P2269
Common causes of P2266
- Most likelyWater intrusion into the sensor connector bridging signal and ground
- PossibleSensor with internal resistance outside specification
- PossibleSignal wire chafed against the frame and shorted to ground
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Water in fuel sensorFuel filter
What each part of P2266 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 66 | The exact fault in that area. |
What to do next
- Note P2266 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2266
What does P2266 mean?
P2266 means "Water in Fuel Sensor A Circuit Low". P2266 is set when the signal line of water-in-fuel sensor A stays below its valid range, typical of a grounded signal wire or of a conductive path that should not be there. It is a generic code, so it means the same on every make.
Is it safe to drive with P2266?
P2266 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2266 fail an emissions test?
P2266 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P2266 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2266 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.