P0269 code definition
Cylinder Number 3 Contribution/Balance Fault
What the P0269 code means
P0269 is an OBD-II diagnostic trouble code which indicates that the engine control module (ECM) detected the cylinder number 3 having low contribution to the running of the engine; low power. The crankshaft sensor sees no crankshaft acceleration for the number 3 cylinder when it is supposed to fire.
What causes the P0269 code?
The number 3 cylinder injector is not spraying in enough fuel or no fuel at all.
The number 3 injector is open or shorted electrically and may have other codes present.
The fuel pressure is low or has low volume due to a clogged fuel filter or defective pump.
The compression in number 3 cylinder is low due to rockers, lifters, cam, rings or cylinder head gasket problems.
Engine mechanical problems may require additional diagnostics to pinpoint problems.
The injector O-ring seals are leaking compression around them. This would have compression blowing out around the injector.
What are the symptoms of the P0269 code?
The check engine light will be illuminated and the code P0269 is set in ECM memory and freeze frame.
The engine will run rough and low on power. The exhaust may blow black smoke.
The engine will have a misfire, causing a buck or jerk and a rough idle.
The engine may lack some power during acceleration if the misfire is active.
The exhaust may have to be regenerated after repairs are made on a diesel engine.
The engine may stall or have other drivability symptoms related to a misfiring or weak cylinder.
How does a mechanic diagnose the P0269 code?
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 following the test procedures
Checks the fuel pressure and volume to specifications for the vehicle
Performs a crankcase pressure test as required during pinpoint testing
Checks cylinder compression compression and repairs as needed
Tests the entire engine compression for a balance problem in the engine
Checks the injector O-rings and seals then replaces the injector
Common mistakes when diagnosing the P0269 code?
- Failing to verify whether the code returns after scanning and deleting the code.
- Failing to check fuel pressure and fuel volume during diagnosis before replacing the injector.
How serious is the P0269 code?
A misfiring cylinder can cause the engine to run lean on the failed cylinder if it is an injector or fuel pressure and volume related problem. The engine may blow black smoke if it has low compression in the cylinder and the injector is still pumping in the fuel to the cylinder.
What repairs can fix the P0269 code?
Replacing the injector if it has failed the tests (new injector seals should be installed)
Replacing the fuel filter and fuel pump if they fail the fuel pressure testing
Repairing the engine for low compression in the cylinder if the compression in the cylinder is below specifications when compared to the other cylinders
Additional comments for consideration regarding the P0269 code
Code P0269 is triggered when the crankshaft sensor does not get an acceleration of the crankshaft from cylinder number 3 power stroke, which indicates that the cylinder is not contributing to engine power. The lack of cylinder acceleration is interpreted by the ECM as a cylinder misfire in a diesel engine. The code is used in mostly diesel engines.
Need help with a P0269 code?
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