What Does P0269 Mean?
The ECM has detected that cylinder 3 is not contributing its expected share of power, indicating a contribution or balance fault. The crankshaft speed variation analysis shows cylinder 3 producing less torque than the other cylinders during its power stroke. The driver will notice rough running, a misfire-like sensation, possible vibration at idle, and reduced overall engine performance.
Common Causes
35%
Faulty fuel injector on cylinder 3 — restricted, stuck, or poor atomization
25%
Low compression on cylinder 3 from mechanical wear or valve issues
20%
Cylinder 3 injector wiring fault reducing injector pulse delivery
12%
Intake or exhaust restriction specific to cylinder 3
8%
Glow plug failure on cylinder 3 (diesel) causing poor combustion
Diagnostic Steps
1
Review live data for cylinder 3 contribution rate compared to all other cylinders — the deviation percentage will quantify the severity of the imbalance.
2
Perform a compression test across all cylinders — cylinder 3 should be within 10% of the highest. Low compression requires a leak-down test to isolate the source (rings, valves, or head gasket).
3
Conduct an injector leak-back test (diesel) by measuring return fuel volume from each injector — excessive leak-back on cylinder 3 indicates a worn injector that cannot maintain rail pressure.
4
Verify cylinder 3 injector operation by monitoring injector current waveform and comparing pulse width to adjacent cylinders — the ECM should be commanding equal or compensated fueling.
5
On diesel engines, check cylinder 3 glow plug resistance (typically 0.5-2.0 ohms) and verify it heats properly — a cold glow plug causes poor combustion especially at startup.
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
The ECM has detected that cylinder 3 is not contributing its expected share of power, indicating a contribution or balance fault. The crankshaft speed variation analysis shows cylinder 3 producing less torque than the other cylinders during its power stroke. The driver will notice rough running, a m...
The most common cause of P0269 (Cylinder 3 Contribution/Balance Fault) is: Faulty fuel injector on cylinder 3 — restricted, stuck, or poor atomization
Typical repair costs for P0269 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driving with a cylinder contribution fault reduces power and can cause increased exhaust temperatures that damage the catalytic converter or turbo. Short-distance driving is acceptable, but continued operation risks secondary damage. Diagnose soon.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0269 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection / Engine Mechanical
Difficulty
Type
Generic (SAE)
Recommended Tools
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