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P0263 is a diagnostic trouble code (DTC) for "Cylinder Number 1 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.
Cylinder Number 1 Contribution/Balance Fault
P0263 is an [OBD-II diagnostic trouble code] which indicates that the engine control module (ECM) detected the cylinder number 1 having low contribution to the running of the engine; low power.
The number one cylinder injector is not spraying in enough fuel or no fuel at all.
The number one injector is open or shorted electrically (other trouble codes would be present).
The fuel pressure is low or has low volume due to a clogged fuel filter or defective pump.
The compression in number 1 cylinder is low due to rockers, lifters, cam, rings or cylinder head gasket problems.
The injector O-ring is leaking compression.
The Check Engine Light will be illuminated and the code set in ECM memory and freeze frame
The engine may run rough and low on power.
The engine will have a misfire causing a buck or jerk and a rough idle.
The engine may lack some power during acceleration while the misfire is active.
Scans codes and documents the freeze frame data in order to verify the problem.
Clears the engine and ETC codes to verify whether the concern comes back
Runs an injector electrical self test
Checks the fuel pressure and volume to specifications
Performs a crankcase pressure test
Checks cylinder compression and repairs as needed
Checks the injector O-rings and seals then replaces the injector if needed
A misfiring cylinder can cause the engine to run lean on the failed cylinder if it is an injector and cause the engine to blow black smoke if it has low compression in the cylinder.
Code P0263 is triggered when the crankshaft sensor does not get an acceleration of the crankshaft from cylinder number 1 power stroke indicating that the cylinder is not contributing to engine power. The injector could also be shorted or open and will cause additional codes that would go with the code P0263 pointing to the injection failure.
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