Engine

P0269 — Cylinder 3 Contribution/Balance Fault

Severity: medium Drive with care, to a shop

What P0269 means

The engine control unit constantly compares how much each cylinder contributes to crankshaft rotation, using the crankshaft position signal and cylinder balance tests. P0269 is stored when cylinder 3 is clearly weaker than the rest. The cause can be fuel delivery, ignition, a mechanical engine problem or wiring.

Symptoms

  • Check engine light on with P0269 stored
  • Rough idle or unstable RPM
  • Loss of power and sluggish acceleration
  • Higher fuel consumption
  • Misfire and vibration, especially from cylinder 3
  • Smell of unburned fuel from the exhaust

Possible causes

  1. Faulty or clogged fuel injector on cylinder 3
  2. Worn spark plug or failed ignition coil on cylinder 3
  3. Damaged wiring or poor connector contact at the injector or coil
  4. Low compression: burnt valve, stuck rings, piston damage or head gasket leak
  5. Vacuum leak near cylinder 3 intake runner
  6. Rarely: ECM fault or outdated software

How to diagnose

  1. Scan all codes and freeze frame data; look for misfire codes such as P0303
  2. Inspect the cylinder 3 spark plug and coil, and check connectors and wiring
  3. Swap the cylinder 3 coil with a neighbor and see whether the fault follows
  4. Test the injector: listen with a stethoscope, measure resistance and check the drive signal
  5. Check fuel pressure and look for vacuum leaks (smoke test or visual inspection)
  6. Perform a compression test, and a leak-down test if needed
  7. Check wiring continuity to the ECM, including power and ground
  8. Check for available ECM software updates

Common fixes

  • Replace the spark plug and/or ignition coil on cylinder 3
  • Clean or replace the cylinder 3 fuel injector
  • Repair damaged wiring and connectors
  • Fix any vacuum leak
  • Do the needed engine repair: valves, rings or head gasket
  • Update or reflash the ECM if confirmed as the cause

Questions and answers

What does P0269 mean?

The ECM detected that cylinder 3 is contributing less power than the other cylinders. It is usually caused by the injector, spark plug, coil, wiring or low compression.

Can I drive with P0269?

Only briefly and gently, to get to a repair shop. A misfire can damage the catalytic converter, and if the check engine light flashes you should not drive.

How can I quickly narrow down P0269?

Swap the ignition coils between cylinder 3 and a neighbor. If the problem moves, the coil is bad. If not, check the spark plug, injector and compression.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.