An internal combustion engine creates energy by combusting a mixture of air and fuel. This process generates the mechanical force needed to propel the vehicle down the road. An engine can have four, six, or eighth cylinders (sometimes even more) depending on the vehicle’s make and model. If cylinder #2 is contributing less power than the other cylinders, the powertrain control module (PCM) will register a P0266 on a scan tool.
Diagnostic trouble code (DTC) P0266 stands for “Cylinder 2 Contribution/Balance.” This is a generic powertrain code that can affect modern vehicles with OBD-II.
Engine cylinders have pistons that move up and down to create mechanical force for the crankshaft. When the piston reaches the top of the cylinder, the compressed air-fuel mixture is ignited, forcing the piston downward. The piston then pushes the residual gasses out of the exhaust valve to complete the four-stroke cycle.
The PCM uses multiple sensors to monitor the engine’s cycle. The computer compares the acceleration of the crankshaft during the power stroke of each cylinder to monitor power output. If cylinder #2 is not creating as much power as the rest, the computer will register a P0266.
Note: The definition of code P0266 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
Take your vehicle’s make and model into account when you’re diagnosing code P0266. Some terminologies and definitions might be different depending on your vehicle. What might work to clear a P0266 code for a Ford might not work for a Chevy. Make sure to consult a repair manual before attempting to diagnose this code.
However, if you lack the necessary auto repair skills and knowledge, you should get your vehicle to a certified mechanic. They can examine your vehicle’s parts and determine the right solution.
There isn’t a simple way to address a P0266 code. You’ll have to research your vehicle’s common issues and fixes to figure out the best course of action. Fortunately, there are plenty of OBD-II resources on the internet. We recommend looking for technical service bulletins for your specific vehicle and getting a Chilton repair manual to learn about its parts. An ALLDATA single-vehicle subscription is another great resource for beginners who are looking to understand trouble codes.
Ignoring the failed fuel injector triggering the P0266 code might save you money now, but it’ll likely cost you double in the long run. Failed fuel injectors can lead to reduced fuel economy, causing you to spend more on gas tank refills. You’re also likely to notice a loss of engine power and poor acceleration, making your vehicle unpredictable. Rather than let these problems get worse, it’s best to replace the faulty fuel injector causing it. Luckily, getting a new fuel injector is fast and easy with CarParts.com.
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