P0263 Code - Cylinder 1 Contribution/Balance Fault

What Does P0263 Mean?

OBD-II Code P0263 is defined as a Cylinder 1 Contribution/Balance

When the engine control module (PCM) detects that cylinder one is not sufficiently contributing to keeping the engine running properly, it will set code P0263.

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What are the common causes of P0263 ?

Depending on year, make, and model, DTC P0263 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 P0263 ?

Like the all engines, the car engine system employs specially developed hydraulic lifters (known as switching roller followers) for the P0263 code intake and exhaust valves. The lifters can be collapsed by disengaging an internal locking pin. The locking pin is disengaged using solenoids to alter oil pressure fed into the lifter.

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