P0293

Cylinder 11 Contribution/Balance Fault

P0293 is a generic OBD-II powertrain diagnostic trouble code: Cylinder 11 Contribution/Balance Fault. It is logged by the engine control unit when the fuel/inj monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P0293
Group
Powertrain
System
Fuel/Inj
Severity
Warning (MIL on, possible limp mode)
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What P0293 means

P0293 indicates that the PCM has detected an insufficient or inconsistent power contribution from cylinder 11 during its power stroke. The PCM measures each cylinder's contribution by analysing the brief crankshaft acceleration spike that occurs as combustion pushes the piston down; when cylinder 11's spike is consistently below the statistical average of the other cylinders, the balance fault is logged. Because an 11-cylinder position exists only in V12, W12, and some specialty inline engines (Cummins ISX twin-injector strategy), P0293 is primarily encountered on BMW N73/N74 V12 (750i/760i, Rolls-Royce Ghost/Phantom), Mercedes-Benz M120/M275/M279 V12 (S600/CL600, SL65, Maybach), VW/Bentley/Audi W12, and Ferrari/Lamborghini V12 platforms.

The most likely root causes are fuel or ignition failures local to cylinder 11: a partially clogged or leaking injector delivering an inconsistent fuel volume, a worn spark plug or weak coil, or low compression from a leaking valve seat or piston ring. Because cylinder 11 typically sits deep in the engine valley on a V12, routine maintenance items like spark plugs and coils are often deferred, making age-related degradation a frequent contributor. Low compression faults are more serious and require cylinder head or engine repair.

Concurrent misfire codes for cylinder 11 (e.g. P030B) and a bank-wide lean or rich trim code may accompany P0293. If the fault is allowed to continue, unburnt fuel damages the catalytic converter and can cause secondary codes for catalyst efficiency below threshold.

Common causes

Most-frequently reported root causes when P0293 is logged.

  • 1
    Partially clogged or failed fuel injector on cylinder 11 delivering insufficient or inconsistent fuel volume.
  • 2
    Worn, fouled, or cracked spark plug in cylinder 11 causing incomplete combustion.
  • 3
    Weak or failed ignition coil on cylinder 11 producing a partial or absent spark.
  • 4
    Low cylinder compression from worn piston rings, a burnt or leaking exhaust valve, or a blown head gasket.
  • 5
    Corroded or loose injector electrical connector on cylinder 11 causing intermittent fuelling.
  • 6
    Fuel pressure issue (weak fuel pump, clogged filter) disproportionately affecting the farthest cylinder in the bank.
  • 7
    Vacuum or intake air leak near cylinder 11 creating a lean condition in that cylinder only.

Symptoms drivers notice

Check Engine Light illuminated, often with companion codes P030B (cylinder 11 misfire) or P0300 (random misfire).
Engine vibration and rough idle most pronounced in large-displacement V12 or W12 engines.
Reduced power output, particularly noticeable above mid-range RPM in V12-powered vehicles.
Degraded fuel economy as the engine management system compensates by enriching other cylinders.
Possible hesitation or stumble during acceleration from a stop.

How to diagnose P0293

A typical diagnostic flow when this code is present.

  1. 1
    Scan for all stored codes and freeze-frame data; confirm P0293 is present and note any companion misfire or fuel trim codes.
  2. 2
    Perform a cylinder power-balance (contribution) test at idle to quantitatively confirm cylinder 11 is underperforming.
  3. 3
    Swap the cylinder 11 spark plug and ignition coil with a known-good adjacent cylinder and re-check; if the fault moves, replace those ignition components.
  4. 4
    Inspect and test the cylinder 11 injector connector for corrosion; measure injector resistance and, if in spec, perform a flow test or ultrasonic cleaning.
  5. 5
    Check fuel pressure at the rail; on V12 engines with dual fuel rails verify pressure balance between banks.
  6. 6
    Perform a cylinder compression test on cylinder 11; if low, follow up with a leak-down test to identify the source (rings, valve, or head gasket).
  7. 7
    Repair or replace the confirmed faulty component, clear codes, and validate the fix with a road test including steady-state highway driving.

Related powertrain codes

Frequently asked questions

Which vehicles are most likely to see P0293?

BMW 7 Series (E65/E66/F01/F02) and Rolls-Royce Ghost/Phantom with N73/N74 V12 engines, Mercedes-Benz S600/CL600/SL65/Maybach with M120/M275/M279 V12, Bentley Continental GT with VW W12, and Ferrari/Lamborghini naturally-aspirated V12 models. No vehicle with fewer than 11 cylinders can set this code.

How does P0293 differ from P0291 and P0292?

P0291 and P0292 are electrical faults in the injector wiring circuit (low or high voltage). P0293 is a combustion-output fault — the cylinder fired (or attempted to) but produced less rotational force than expected. The injector circuit may be electrically healthy while P0293 is active if the injector sprays poorly or if an ignition or compression fault is responsible.

Can a failing injector cause both P0291/P0292 and P0293 at the same time?

Yes. An injector with a partially shorted coil can produce an out-of-range electrical reading (triggering P0291 or P0292) while also delivering insufficient or erratic fuel volume (triggering P0293). When both types appear together, the injector itself is usually the primary suspect.

Is low compression a common cause on high-mileage V12 engines?

It is more common than on smaller engines due to the sheer number of combustion events and the often-deferred maintenance schedules on expensive V12 vehicles. Cylinders deep in the engine valley (cylinder 11 is typically on the rear of the secondary bank) accumulate more heat soak and are harder to inspect, making valve seat wear a known failure mode after 150,000–200,000 km.

Disabling P0293 in software

RaceTune can permanently disable P0293 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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