Code
P02C2
Generic
P — Powertrain
Cylinder 11 - Fuel Trim at Max Limit
Views:
UK: 17
EN: 23
RU: 25
AI status
Completed
Completed
100%
Causes
- Faulty or clogged fuel injector on cylinder 11
- Open/short or poor connection in the injector wiring or connector
- Low fuel rail pressure or faulty fuel delivery (pump, regulator, filter)
- Intake air leak or vacuum leak affecting cylinder 11
- Compression loss (mechanical issue) on cylinder 11
- Faulty sensors affecting fueling control (MAF, MAP, crank/cam position, or O2/UEGO)
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or vibration, especially at idle or low load
- Cylinder contribution imbalance or cylinder-specific misfire counts
- Loss of power or hesitation under acceleration
- Increased fuel consumption or visible smoke (diesel)
- Difficulty starting in some cases
What to check
- Read and record DTC(s) and freeze frame data with a scan tool
- Check for additional related codes (injector circuits, fuel pressure, misfire, sensor faults)
- Monitor live PIDs: cylinder 11 fuel trim, STFT/LTFT, injector pulse width, misfire counts, fuel rail pressure, MAF/MAP, O2 sensor readings
- Visual inspection of injector wiring harness and connector at cylinder 11 for damage, corrosion, looseness or bent pins
- Measure injector resistance at cylinder 11 and compare to spec
- Check fuel rail pressure and compare to manufacturer specification (static and under load)
Signal parameters
- Cylinder 11 fuel trim % (short-term and long-term)
- Injector pulse width (ms) for cylinder 11
- Injector electrical resistance (ohms) and injector driver current waveform
- Fuel rail pressure (kPa/psi) at idle and under load
- MAF (g/s) and/or MAP (kPa) readings
- O2 / UEGO sensor voltage or lambda for the affected bank
Diagnostic algorithm
- Record freeze frame and all stored codes; clear codes and attempt to reproduce while monitoring live data.
- Verify fuel rail pressure and filter condition; restore correct fuel pressure if out of range and retest.
- Inspect harness/connector for cylinder 11 injector; repair any corrosion, damaged wires, or poor pins. Wiggle-test while watching injector command and response.
- Measure injector resistance and compare to spec. If abnormal, remove and visually inspect injector for contamination or mechanical seizure.
- Use a lab scope or injector test tool to view injector driver waveform and confirm injector is being commanded and energized correctly.
- Swap the suspect injector with another cylinder (if possible). If the fuel-trim fault moves to the new cylinder, replace the injector. If it stays on cylinder 11, suspect wiring, mechanical or intake/exhaust issues at that cylinder.
- Perform compression or leak-down test on cylinder 11; repair valves, piston rings, or head gasket as indicated.
- Perform intake manifold smoke test and exhaust system inspection for leaks that would affect oxygen sensor readings or local cylinder trim.
- Check MAF/MAP/O2 sensor operation; replace or recalibrate sensors if providing incorrect data and other causes ruled out.
- If wiring, injector and mechanical tests pass, consider ECU/PCM testing or reflashing as a last step.
- After repair, erase codes and perform a road test and confirm fuel trim and misfire counts have normalized.
Likely causes
- Stuck or slow injector (reduced flow) on cylinder 11 causing lean condition
- Injector driver circuit failure or intermittent connector causing misfire/underfueling
- Restricted fuel supply or low rail pressure limiting injector flow to cylinder 11
- Intake manifold gasket leak or leaking intake runner at cylinder 11
- Low compression from valve, piston ring, or head gasket problem
- Faulty MAF/MAP or O2 sensor providing incorrect inputs leading to excessive trim for that cylinder
Fault status
Status
Fuel trim for cylinder 11 has reached the maximum correction limit. The PCM cannot bring that cylinder to target mixture; further diagnosis required to identify injector, wiring, fuel supply, mechanical, or sensor causes.
Repair difficulty: Medium
Diagnostic time: 1-4 hours
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