P2264 is the general circuit code for water-in-fuel sensor A, the probe in the diesel filter or separator that detects water by its conductivity. GM's 2018 diesel tables explain a neat self-test: after the ignition has been off for more than about 8 h, a healthy sensor briefly signals water during the first 0.3 to 1.8 s after power-up. If that pulse is missing in 10 of 14 samples of 100 ms, P2264 sets as a Type C code that turns on the Service Vehicle Soon lamp rather than the MIL; versions exist for sensors wired to the ECM and to the fuel tank zone module. Ford's 2014 PCM table also lists the code. With the circuit faulty, the warning for real water no longer works, so the separator should be drained by hand until it is fixed. P2265 to P2268 split the fault further.
Low severity. Can I keep driving?You can normally keep driving. If it affects the fuel level, do not trust the gauge and refuel earlier than usual.
Symptoms
- Service lamp or message on, engine runs normally
- No warning if water actually collects in the separator
Most likely causes
- Water-in-fuel sensor that no longer performs its power-up self-test
- Corroded or loose connector at the filter housing, exposed to road spray
- Open or damaged wire between sensor and ECM or tank zone module
- Incompatible sensor fitted during a filter change
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: easy
What each character of P2264 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 2: Fuel injection
- 64: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2264?
You can normally keep driving. If it affects the fuel level, do not trust the gauge and refuel earlier than usual.
What causes code P2264?
The most common causes are: water-in-fuel sensor that no longer performs its power-up self-test; corroded or loose connector at the filter housing, exposed to road spray; open or damaged wire between sensor and ECM or tank zone module.
Related codes
- P2265Water in Fuel Sensor A Circuit Range/Performance
- P2266Water in Fuel Sensor A Circuit Low
- P2267Water in Fuel Sensor A Circuit High
- P2268Water in Fuel Sensor A Circuit Intermittent
- P2269Water in Fuel Condition - Sensor A
Sources
- gsi.ext.gm.com: 18OBDG04 Engine Diagnostics
- performanceparts.ford.com: 2014 BOSS 302S OBDII Codes
- patents.google.com: en
- en.wikipedia.org: Water in fuel sensor
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.