P2266 OBD-II Trouble Code: Low Voltage in Water in Fuel Sensor

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Cost of diagnosing the P2266 code

P2266 is a diagnostic trouble code (DTC) for "Low Voltage in Water in Fuel Sensor". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

P2266 code definition

The P2266 code is set when low voltage is detected in the WIF (Water in Fuel) Sensor circuit at the Engine Control Module (ECM). Other fuel system codes may set along with P2266.

What the P2266 code means

P2266 is the generic OBD-II code for Water in Fuel Sensor Circ Low. This code indicates a low voltage signal in the WIF circuit.

What causes the P2266 code?

A variety of conditions may trigger a vehicle to set this code:

  • The WIF Sensor Signal circuit may be shorted to the ground.
  • The WIF Sensor Signal circuit may be shorted to the sensor ground.
  • There may be water or other contaminants in the WIF Sensor.
  • The ECM (Engine Control Module) may be faulty.

What are the symptoms of the P2266 code?

The P2266 code may cause no symptoms at all, or the vehicle may misfire, hesitate, or fail to start.

How does a mechanic diagnose the P2266 code?

Mechanics may use a variety of procedures in diagnosing the cause of a P2266 code, beginning with using a scan tool to verify that the code is active. If it is, the next step is to measure the voltage between the Water in Fuel Sensor Signal circuit and Water in Fuel Sensor Ground circuit of the harness connector to ensure that it measures at the correct voltage. Depending upon the results of the voltage test, the technician may replace the WIF Sensor, or go on to test voltage in other parts of the system, or the Engine Control Module itself. Appropriate repairs or replacement may then be made.

Common mistakes when diagnosing the P2266 code

If proper procedures aren’t followed, the source of the problem could be missed due to the fact that there are several components involved in the functioning of the WIF Sensor. Each step in the process must be followed in order to determine whether the fuel is being contaminated, or there is a fault in the wiring, connector, or ECM.

What repairs can fix the P2266 code?

Repairing the P2266 code may involve a variety of steps, depending upon the source of the fault:

  • A scan tool is used to verify the code, then the codes are reset and the vehicle is road tested to determine if the code comes back.
  • The voltage between the WIF Sensor Signal circuit and the WIF Sensor Ground circuit is tested, and if it measures correctly, the Water In Fuel Sensor may be replaced.
  • Resistance between the WIF Sensor Signal circuit and the harness connector ground is measured, and repaired if there is a short.
  • If resistance measures correctly, the ECM may be replaced.

Additional comments for consideration regarding the P2266 code

Sensors frequently demonstrate intermittent condition behaviors, only occasionally setting the P2266 code. This can make diagnostics a challenge, because it can be difficult to determine the source of the fault if the problem is not consistent. Vehicle sensors are typically considered part of regular maintenance procedures and should be replaced according to the manufacturer’s recommendations at routine intervals in order to prevent further potential damage.

Need help with a P2266 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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P2266
Check Engine Light

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Nazareth

26 years of experience
168 reviews
Nazareth
26 years of experience
Mercedes-Benz CLA250 - Check Engine Light is on - Los Angeles, California
Polite and very professional! Nazareth quickly identified my car was suffering from low voltage issues and the battery was the problem. The reader was showing 8 volts hence why my car didn’t receive enough power to start, it needed 12v. My battery was 4 years old and never been changed. Thank you Nazareth!

Cornelius

17 years of experience
78 reviews
Cornelius
17 years of experience
Chevrolet Cobalt - Check Engine Light is on - Peachtree City, Georgia
He was very helpful with explaining what could lead to my check engine light being on. And helping clear my engine light.

Marco

28 years of experience
78 reviews
Marco
28 years of experience
Nissan Maxima - Check Engine Light is on - Highland, California
Marco did a great job of finding the source of the problem and his recommendations were greatly appreciated.

Juan

8 years of experience
128 reviews
Juan
8 years of experience
Chevrolet Tahoe - Check Engine Light is on - Altamonte Springs, Florida
Juan was on time for both appointments. He was knowledgeable and polite and I will most definitely be requesting him for my next steps based on the quote he provided me for other issues I need to address. Excellent customer service and top notch repair work!


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