P2268
Water in Fuel Sensor A Circuit Intermittent
Fuel system (diesel)
Generic OBD-II
Medium
What it means
P2268 means the water-in-fuel sensor circuit is giving an intermittent or erratic signal. This sensor (common on diesels, usually in the fuel filter housing) warns you when water collects in the fuel. The fault itself won't stop the engine, but it means the warning is no longer dependable — usually a loose or corroded connector — so it's worth chasing down before water reaches the injectors.
Medium
Can I keep driving? Usually yes — the engine runs, but you lose reliable water-in-fuel warning, so get it checked before water can reach the injection system.
Common symptoms
What you'll notice
- Check-engine light on
- Water-in-fuel warning lamp may flicker or behave erratically
- Usually no change in how the engine runs
Common causes
Most likely first
- Intermittent open or short in the sensor wiring or connector (often at the fuel filter housing)Likely
- Corrosion or moisture at the water-in-fuel sensor connectorCommon
- Faulty water-in-fuel sensorCommon
- Faulty ECM/PCM (least likely)Less often
How to diagnose & fix
Work through it in order
- Scan and confirm P2268 and check freeze-frame data.
- Wiggle-test the harness and connector at the sensor while watching the signal for dropouts.
- Inspect the connector for corrosion, moisture, or spread pins; clean or repair.
- Drain the fuel/water separator and check the sensor's resistance against spec.
- Replace the water-in-fuel sensor if it fails; consider the ECM only as a last resort.
FAQ
Quick answers
Is it safe to drive with P2268?+
Short term, yes — the engine still runs. But this sensor warns you of water in the diesel fuel, and an intermittent circuit means that warning is unreliable. Water in a diesel injection system is expensive, so address it soon.
Can I just clear P2268?+
It will return the next time the circuit glitches. Because it's intermittent, focus on the connector and wiring rather than clearing it.
Related codes
Often seen with P2268
Read & clear P2268 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX