P0293
Cylinder 11 Contribution/Balance.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 2
- AreaFuel and air metering (injector circuit)
- 93
- FaultThe specific fault in that area
What it means
P0293 is the generic code for a fault in the cylinder 11 contribution or balance test. The engine control unit monitors how much each cylinder contributes to engine output, typically through crankshaft speed variation, and it saw cylinder 11 contributing noticeably less (or sometimes more) than the others. This only applies to engines with at least 11 cylinders, so it is rare and the exact cylinder numbering and test method depend on the engine.
Symptoms
- Rough running or noticeable engine vibration, especially at idle
- Misfire or hesitation under load
- Loss of power and poor acceleration
- Engine warning light on, possibly flashing under heavy load
- Increased fuel consumption
- Uneven or lumpy idle on cold start
Possible causes
- Faulty injector on cylinder 11 (blocked, leaking or stuck, or its wiring/driver circuit)likely
- Worn or faulty spark plug or ignition coil on cylinder 11 (petrol engines)likely
- Wiring or connector fault at the cylinder 11 injector or coil, such as corrosion, chafing or poor pin tensionpossible
- Low compression on cylinder 11 from valve, piston ring or head gasket damagepossible
- Vacuum or intake leak local to cylinder 11, or a fuel delivery problem affecting that bankpossible
- Crankshaft position sensor or reluctor wheel fault causing false balance readingsrare
- Control unit fault or outdated software affecting the balance testrare
How to diagnose
- Read all stored and pending codes and freeze frame data, noting engine load, speed and temperature when the fault set; check for related misfire or injector codes
- Confirm the engine's cylinder numbering and layout from the manufacturer data so you are testing the correct cylinder 11
- Inspect the wiring and connectors at the cylinder 11 injector and coil for damage, moisture and corrosion
- Review live data for misfire counters or cylinder contribution values to see if the fault is constant or load dependent
- Swap the coil or injector with a neighbouring cylinder (where the design allows) and see whether the fault follows the part
- Remove and inspect the spark plug for wear, fouling or damage (petrol engines)
- Test injector resistance and operation and check the fuel pressure against specification
- Carry out a compression or cylinder leak-down test on cylinder 11 if the electrical and fuel checks are fine
How to fix
- Replace the faulty injector or clean/service it if the manufacturer procedure allows
- Replace the worn spark plug or failed ignition coil on cylinder 11
- Repair or replace damaged wiring and connectors in the affected circuit
- Repair mechanical faults found in cylinder 11, such as valve or piston ring wear or head gasket failure
- Seal any intake or vacuum leak and correct fuel delivery faults
- Replace a faulty crankshaft sensor, or update the control unit software only where the manufacturer lists it as a known cause
Can I keep driving?
The car can usually be driven gently for a short time to get it to a workshop, but avoid heavy loads. If the warning light flashes or the engine runs very roughly, stop driving because unburnt fuel can damage the catalytic converter and a mechanical fault could worsen.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.