Engine

P0293 — Cylinder 11 Contribution/Balance Fault

Severity: medium Drive with care, to a shop

What P0293 means

P0293 means the engine control module compared how much each cylinder contributes, based on crankshaft speed, and found cylinder 11 weaker or different from the rest. Normally every cylinder gets the right amount of fuel from its injector, a good spark, and enough compression to burn the mixture. This code only applies to engines with at least 11 cylinders, such as V12s.

Symptoms

  • Check Engine light is on
  • Rough or uneven idle
  • Loss of power under load
  • Hesitation or stumbling like a misfire
  • Worse fuel economy

Possible causes

  1. Faulty fuel injector on cylinder 11 (clogged, sticking or open circuit)
  2. Ignition fault on cylinder 11: coil, spark plug or plug wire
  3. Damaged wiring or poor connection at the injector or coil
  4. Low compression in cylinder 11 (rings, valves, head gasket)
  5. Air leak or fuel delivery problem affecting one cylinder
  6. Rarely, an ECM fault

How to diagnose

  1. Scan all codes and freeze-frame data; look for related misfire codes (P0300–P0312)
  2. Inspect cylinder 11 connectors and wiring for corrosion, chafing and oil
  3. Check the plug and coil on cylinder 11, and swap them with a good cylinder to see if the fault follows
  4. Test the injector: coil resistance, control signal, and listen for clicking with a stethoscope
  5. Measure fuel pressure and check injector flow
  6. Run a compression test and a cylinder leak-down test if needed
  7. If everything checks out, evaluate the ECM and look for software updates

Common fixes

  • Replace or clean the cylinder 11 fuel injector
  • Replace the spark plug and/or ignition coil
  • Repair the wiring or connector for cylinder 11
  • Fix the mechanical problem (valves, piston rings, head gasket)
  • Reflash or replace the ECM only after other causes are ruled out

Questions and answers

What does P0293 mean?

It means the ECM sees cylinder 11 contributing unevenly to engine output. The cause is usually the injector, ignition, wiring or a mechanical problem in that cylinder.

Can I drive with P0293?

Only briefly and gently, to reach a shop. If the engine runs rough or the Check Engine light flashes, stop driving, because the catalytic converter can be damaged.

How can I quickly find the cause of P0293?

Swap the cylinder 11 coil and spark plug with those from a healthy cylinder and clear the code. If the fault moves, the ignition part is bad; if not, check the injector, wiring 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.