Powertrain, generic (extended)

P2264 Water in Fuel Sensor A Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

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

Symptoms

  • Service lamp or message on, engine runs normally
  • No warning if water actually collects in the separator

Repair estimate

DifficultyEasyDIY possible
Parts and labour€30–200
Time0.3–1 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

water in fuel sensorfuel filter housing

Related codes

P2265P2266P2267P2268P2269

References: gsi.ext.gm.com, performanceparts.ford.com, patents.google.com, en.wikipedia.org.