P0266 OBD-II Trouble Code: Cylinder 2 Contribution/Balance Fault

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0266 code

P0266 is a diagnostic trouble code (DTC) for "Cylinder 2 Contribution/Balance Fault". 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 diagnostic. 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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0266 DIAGNOSTIC Get a fair and transparent estimate upfront

P0266 code definition

Cylinder 2 Contribution/Balance Fault

What the P0266 code means

This diagnostic trouble code indicates that the powertrain control module has detected that the reference voltage from the fuel injector on cylinder 2 has fallen out of the range of acceptance set by the vehicle manufacturer.

What are the causes of the P0266 code?

  • Damaged wiring or connectors associated with the fuel injector circuit on the number 2 cylinder may be present.

  • A faulty or restricted fuel injector on the number 2 cylinder may exist.

  • The powertrain control module could be malfunctioning.

What are the symptoms of the P0266 code?

Symptoms of this trouble code that the driver may experience would include:

How does a mechanic diagnose the P0266 code?

  • A mechanic may begin diagnosing this trouble code by removing any engine covers that exist to gain access to the fuel injectors.

  • Once the fuel injectors are visible, the mechanic would inspect the wiring and connectors for damages that may have been caused by mice or other small animals that could have nested under the engine cover.

  • Next, the mechanic would test the fuel injector on the number 2 cylinder for proper function using the manufacturer’s suggested procedure.

  • If the cause of the issue has still not been revealed after these two tests have been performed, the mechanic would use a high tech scan tool to test the powertrain control module to ensure that it is working correctly.

After all tests have been performed and the mechanic has come up with a diagnosis, he/she would relay the information over to the customer to make an informed repair decision.

Common mistakes when diagnosing the P0266 code

A common mistake that could be made when diagnosing this trouble code would be to replace the fuel injector on the number 2 cylinder when it is actually the wiring or connector that is faulty. It is very important to check all possible causes of a problem before making a repair decision.

How serious is the P0266 code?

This code would be considered serious because the engine will not run properly with the cylinder 2 injector not functioning as it should. This issue would be worse on 4 cylinder and 6 cylinder engines as opposed to 8 cylinder engines due to the fact that the extra cylinders can make up for the imbalance that the malfunctioning injector on cylinder 2 would cause. A code such as this should be diagnosed and repaired as soon as possible because continuous driving with a misfire condition can cause damage to the engine.

What repairs can fix the P0266 code?

  • Repairing or replacing the wiring or connector that is associated with the fuel injector on the number 2 cylinder

  • Replacing the fuel injector on the number 2 cylinder.

  • Running a good fuel system cleaning through your engine to clear any restrictions the fuel injector on the number 2 cylinder may have.

  • Replacing the powertrain control module

Additional comments regarding the P0266 code

This code will likely be associated with a P0302 code for a cylinder 2 misfire. While the mechanic is inspecting the fuel injector circuitry, it would be a good idea to have him/her check the wiring on the ignition coil or spark plug wire to be sure that the ignition going to the number 2 cylinder is working properly.

Need help with a P0266 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

P0266
trouble codes
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0266 code.

SCHEDULE P0266 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


Related questions

I have check engine light on and the code is showing p0266 ?

P0266 means that the fuel injector on cylinder number two does not pass the self tests that the Electronic Control Unit performs. It is often accompanied by a code P0302 for an engine misfire. It could be that you have...

More related articles

P0043 OBD-II Trouble Code: HO2S Heater Control Circuit Low (Bank 1 Sensor 3)
P0043 P0043 code definition P0043 stands for low circuit voltage for the heated oxygen sensor bank 1 sensor 3. This code can be seen with P0044 and P0042. What the P0043 code means The definition of P0043 is low voltage...
P2173 OBD-II Trouble Code: Throttle Actuator Control System - High Airflow Detected
P2173 code definition Throttle Actuator Control System - High Airflow Detected What the P2173 code means Code P2173 means that there is...
P0253 OBD-II Trouble Code: Injection Pump Fuel Metering Control "A" Low (Cam/Rotor/Injector)
P0253 means the fuel control actuator and the fuel metering sensor are not communicating well due to a faulty actuator, or a circuit issue.

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com