P2E5C

Code

Generic P — Powertrain

Cylinder 4 Alternative Fuel Misfire Detected

Brand: Generic

Type: P — Powertrain

Views: UK: 17 EN: 40 RU: 13

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Causes

Faulty ignition on cylinder 4 (coil, spark plug, plug lead)
Injector or alternative-fuel injector failure or blockage on cylinder 4
Low compression or mechanical issue in cylinder 4 (valve, piston, head gasket)
Fuel delivery problem specific to alternative fuel system (pressure regulator, vaporizer/mixer, injectors)
Fuel quality or incorrect fuel/air ratio for the conversion system
Wiring or connector fault to injector or ignition component on cylinder 4

Symptoms

MIL/Check Engine lamp illuminated
Rough idle or vibration, especially at idle
Reduced engine power and hesitation on acceleration
Increased fuel consumption and visible smoke on some fuels
Misfire counts present in freeze frame/live data for cylinder 4
Possible difficulty starting or stalling under load

What to check

Read and record DTC P2E5C and any additional stored codes; save freeze-frame and live data
Monitor misfire counters and crankshaft speed variation for cylinder 4 on a scan tool
Inspect spark plug, coil/ignition lead, and replace if fouled or damaged
Swap ignition coil or spark plug with another cylinder to see if misfire follows
Inspect and test injector/nozzle (or alternative-fuel injector) for spray pattern, resistance and operation; swap with another cylinder if practical
Measure fuel rail/alternative-fuel system pressure and compare to spec

Signal parameters

Misfire counter / cylinder contribution (counts per minute or misfire events)
Crankshaft speed variation signal (degrees crank/N-tooth irregularity)
Short term and long term fuel trim (%)
O2/AFR sensor voltage or A/F ratio (0.1–0.9 V for narrowband; target AFR for wideband)
Fuel rail pressure (psi or bar) — alternative-fuel system pressure where applicable
Injector pulse width (ms) and injector current/driver status

Diagnostic algorithm

Verify the fault: confirm P2E5C is current or stored, record freeze-frame and live data, and note operating conditions when the fault set (fuel type, load, temperature).
Visual inspection: examine cylinder 4 spark plug, coil/lead, injector/nozzle, and wiring for obvious damage, carbon fouling, or fuel contamination. Repair as needed.
Basic swap test: swap the ignition coil and/or injector from cylinder 4 with another cylinder. If the misfire follows the component, replace the faulty part.
Fuel system check: measure alternative-fuel supply/rail pressure and regulator function; verify injector/nozzle spray pattern and operation. Repair or clean/replace injectors or conversion components as required.
Compression/leak-down: perform static compression and/or leak-down test on cylinder 4 and compare to adjacent cylinders. Investigate mechanical repair if compression is out of spec.
Electrical inspection: test injector and coil circuits for voltage, ground, continuity and short to battery; check PCM driver outputs. Repair wiring or connectors found faulty.
Intake/air leaks and timing: check for vacuum leaks, intake manifold gasket issues and verify ignition timing/valve timing if applicable to the conversion system.
Reproduce and verify: clear codes and road test on the same alternative fuel. Monitor misfire counters, fuel trims and O2/AFR. If issue persists, consult conversion-system supplier or dealer resources for software calibration or module replacement.
If all tests pass and fault remains intermittent, perform extended drive-cycle data logging and consider replacing suspect components (coil, injector) or further module-level diagnosis.