P0266 Code - Cylinder 2 Contribution/Balance Fault

What Does P0266 Mean?

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.

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What are the common causes of P0266 ?

Depending on year, make, and model, DTC P0266 may have number of causes. Here are some of the most common.

• Dirty Fuel Injectors – This is the number one cause of cylinder balance issues. This can be caused by dirty fuel, poor onboard fuel filtering, or carbon deposits. In some models, biodiesel has been blamed, perhaps for its low detergent qualities. Intensive fuel injector cleaning may solve the problem, but sometimes injector replacement is recommended.
• Improper Replacement – Some have gone forward with injector replacement, only to find it doesn’t solve the problem. If diesel fuel injectors are replaced, they must be run through a “learning procedure,” which enables the ECM and injector driver to learn the individual injector’s characteristics.
• Mechanical Problems – Anything that affects cylinder function, such as burnt valves, worn rings, or leaking head gasket, can affect power output of one or more cylinders, without necessarily causing a misfire.

How do you troubleshoot P0266 ?

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0266 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.

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