AutoCodes – Generic – P0266

P0266 Code - Cylinder 2 Contribution/Balance Fault

Quick Answer

Code P0266 is triggered when the Engine Control Module (ECM) detects that the acceleration rate of the crankshaft for Cylinder 2 was less than a calibrated amount. Common causes include Dirty Fuel Injector 2, Faulty Fuel Injector 2, Plugged Fuel Injector 2. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0266 indicates Cylinder 2 Contribution/Balance Fault.
Common causes: Common causes include Dirty Fuel Injector 2, Faulty Fuel Injector 2, Plugged Fuel Injector 2.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 44,872

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 02, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0266 Description

Code P0266 is triggered when the Engine Control Module (ECM) detects that the acceleration rate of the crankshaft for Cylinder 2 was less than a calibrated amount. During normal conditions, the ECM turns the Fuel Injectors ON and OFF in the Fuel Injection System.

OBDII Code P0266 - Cylinder 2 Contribution/Balance Fault - AutoCodes.com — P0266 Code - Cylinder 2 Contribution/Balance Fault

What does this mean?

What are the Possible Causes of the DTC P0266?

Dirty Fuel Injector 2
Faulty Fuel Injector 2
Plugged Fuel Injector 2
Fuel Injector #2 harness is open or shorted
Fuel Injector #2 circuit poor electrical connection

How to Fix the DTC P0266?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Clogged or partially clogged fuel injector can cause this code. Start by performing an injector flush before replacing the injector.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0266 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0266 code?

Need more information on how to fix the P0266 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0266 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0266 Audi — Cylinder 2 Contribution Balance
P0266 Chrysler — Cylinder 2 Contribution/Balance Fault
P0266 Dodge — Cylinder 2 Contribution/Balance Fault
P0266 Ford — Cylinder 2 Injector Contribution/Balance Fault
P0266 Mercedes-Benz — Cylinder 2 Contribution/Balance Fault
P0266 Volkswagen — Cylinder 2 Contribution Balance

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0266 Code

1. What does the OBDII code P0266 mean?

The P0266 code indicates a Cylinder 2 Contribution/Balance Fault, meaning the power output from cylinder 2 is not within the expected range compared to other cylinders.

2. What are the common symptoms of code P0266?

Symptoms include rough idling, engine misfires, reduced power, poor fuel economy, and in some cases, the Check Engine Light being illuminated.

3. What causes the P0266 code to appear?

Common causes include a faulty fuel injector, clogged fuel injector, low fuel pressure, engine compression issues, or wiring problems related to cylinder 2.

4. Can a bad fuel injector trigger the P0266 code?

Yes, a clogged, leaking, or malfunctioning fuel injector on cylinder 2 is a common cause of the P0266 code.

5. How do you diagnose the P0266 code?

Diagnosis involves using a scan tool to monitor cylinder balance, inspecting the fuel injector and wiring for cylinder 2, checking fuel pressure, and performing a compression test.

6. Can driving with a P0266 code damage the engine?

Yes, driving with this code for an extended period can cause further damage, such as unburned fuel damaging the catalytic converter or increased wear on the engine.

7. How is the P0266 code typically fixed?

Repairs may include cleaning or replacing the fuel injector for cylinder 2, repairing wiring or connectors, fixing fuel pressure issues, or addressing engine compression problems.

8. Can dirty fuel cause the P0266 code?

Yes, dirty or contaminated fuel can clog injectors or fuel lines, potentially leading to the P0266 code.

9. How much does it cost to fix the P0266 code?

The cost varies depending on the root cause. Replacing a fuel injector can cost $200–$600, while more extensive repairs, like fixing engine compression, may cost significantly more.

10. Can a faulty PCM cause the P0266 code?

While rare, a malfunctioning Powertrain Control Module (PCM) could misinterpret or fail to process cylinder balance data, triggering the code.