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DTC codes / P02xx · Fuel and air metering (injector circuits) / P0269

P0269Cylinder 3 Contribution/Balance

P0269 means the powertrain control module has detected that cylinder 3 is contributing less power than the other cylinders, based on crankshaft speed fluctuations measured by the crank position sensor. The computer sets this code when the misfire or imbalance for cylinder 3 exceeds a calibrated threshold, indicating a mechanical, fuel, or ignition problem specific to that cylinder.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Rough idle or shaking that is often more noticeable when the engine is cold
  • A flashing or steady check engine light, sometimes accompanied by a traction control light
  • Noticeable loss of power or hesitation during acceleration
  • Poor fuel economy compared to normal driving
  • Often no symptoms besides the warning light, especially at higher speeds or light load
  • Occasional smell of unburned fuel from the exhaust if the misfire is severe

Common causes, most likely first

  1. Worn or fouled spark plug in cylinder 3
  2. Faulty ignition coil or spark plug wire for cylinder 3
  3. Clogged or leaking fuel injector for cylinder 3
  4. Vacuum leak at the intake manifold runner or gasket near cylinder 3
  5. Low compression from worn piston rings, valves, or head gasket in cylinder 3
  6. Mechanical valvetrain issue such as a collapsed lifter or worn cam lobe affecting cylinder 3
  7. Wiring or connector problem to the cylinder 3 injector or coil

How to diagnose and fix it

  1. Scan all stored codes and freeze-frame data to confirm P0269 is current and not history
  2. Inspect the spark plug and ignition coil for cylinder 3, swapping the coil with a known-good cylinder to see if the misfire moves
  3. Perform a cylinder contribution test or misfire counter check with a scan tool to verify cylinder 3 is the problem
  4. Check fuel injector operation with a noid light or injector balance test, and inspect wiring for corrosion or damage
  5. Run a compression test and, if low, a leak-down test on cylinder 3 to rule out mechanical faults
  6. Smoke-test the intake system for vacuum leaks that disproportionately affect cylinder 3
  7. Replace the confirmed faulty component and clear codes, then road-test to verify the misfire is gone

Cylinder 3 misfires that fool good technicians

  • A vacuum leak at the intake manifold gasket can lean out one cylinder more than others and set a single-cylinder contribution code without any ignition or fuel fault.
  • A failing fuel injector may still click and pass a resistance test but deliver uneven fuel volume, so an injector balance test is more reliable than a simple ohm check.
  • Low compression from a worn cam lobe or collapsed lifter can mimic an ignition misfire and will not improve with new coils or plugs, so always verify mechanical health before parts swapping.
  • The code can be set by a dirty mass airflow sensor that skews fuel trim and causes one cylinder to run lean enough to misfire, even though the sensor is not cylinder-specific.
  • A sticking EGR valve or carbon buildup on intake valves can cause a single-cylinder misfire that only appears at certain engine speeds and loads, making it easy to miss during a quick idle check.

Can I keep driving with P0269?

You can drive cautiously to a repair shop if the check engine light is steady and the engine runs smoothly, but avoid heavy acceleration or towing. If the light flashes or the engine shakes badly, stop driving because unburned fuel can quickly damage the catalytic converter.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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