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

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0266 DIAGNOSTIC 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 P0202 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 1-800-701-6220

P0266
trouble codes
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0266 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,810

Rating Summary
4,424
187
47
28
124
4,424
187
47
28
124

Joel

19 years of experience
741 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

Christopher

15 years of experience
41 reviews
Christopher
15 years of experience
Honda Accord - Check Engine Light is on - Fairburn, Georgia
Christopher was excellent! He explained everything in detail to make sure I understood. He was professional and provided me with the next course of actions to resolve my care issues. I'm glad he was sent to service my car.

Alexander

18 years of experience
58 reviews
Alexander
18 years of experience
Saab 9-7x - Check Engine Light is on - Kissimmee, Florida
He was very friendly and very helpful . I felt like it was being around a close friend , also gave me so very good advice on my car & future advice about it . Highly recommend mechanic, would use his services again .

Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Jeep Patriot - Check Engine Light is on - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

More related articles

P2104 OBD-II Trouble Code: Throttle Actuator Control System Forced Idle
P2104 P2104 trouble code definition Throttle Actuator Control System Forced Idle What the P2104 code means P2104 is an OBD-II generic code for the engine control module (ECM) detecting a major failure in the throttle actuator control (TAC) system causing...
P0423 OBD-II Trouble Code: Heated Catalyst Efficiency Below Threshold (Bank l)
P0423 P0423 code definition Heated Catalyst Efficiency Below Threshold (Bank l) What the P0423 code means P0423 is an OBD-II generic code that the engine control module (ECM) got input from the heated catalyst efficiency sensor for bank 1 that...
P0360 OBD-II Trouble Code: Ignition Coil I Primary / Secondary Circuit Malfunction
Trouble code P0360 means the powertrain control module (PCM) detects a problem with the primary or secondary circuit of an ignition coil.

Related questions

I changed spark plugs and wires & cleaned throttle body, car idles rough and gas mileage is changed does not backfire or anything

A few different components could be causing your issue. Your symptoms sound at first like a spark issue. If a plug was tightened down too hard, the gap can become smaller than intended. This would decrease the power of the...

I had a trouble code P0090 and now I have P2177

This may not be very hard to solve. Code P2177 means your engine is running too lean. The most common cause of this is an air leak in the intake system. Since you've just been working under the hood, it's...

Accidentally hit key fob and ignition went off

The vehicles computer must be scanned to see which trouble codes have come up then an experienced technician, like one from YourMechanic, must diagnose the actual problem in this case. The codes present may not have seemed to have anything...

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.

1-800-701-6230 · hi@yourmechanic.com