Code
P1339
PEUGEOT
P — Powertrain
Cylinder 3 ignition fail malfunction
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EN: 2
RU: 4
AI status
Completed
Completed
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Causes
- Faulty ignition coil or coil pack at cylinder 3
- Worn or fouled spark plug in cylinder 3
- Open, shorted or corroded wiring/connector for coil 3 (power, ground or control)
- Faulty ignition control driver inside the PCM/ECM
- Weak battery/poor charging system voltage during operation
- Low compression or mechanical problem on cylinder 3
Symptoms
- Check Engine Light (MIL) illuminated
- Engine runs rough or vibrates, especially at idle
- Reduced engine power and throttle response
- Poor fuel economy and increased emissions
- Possible misfire felt under acceleration or during load
- Misfire fault stored for cylinder 3 (intermittent or permanent)
What to check
- Read freeze-frame data and live OBD data: misfire counts, RPM, load, coolant temperature and battery voltage at time of fault
- Scan for related DTCs (P0303, P0353, cam/crank sensor codes) and pending codes
- Visual inspection of coil, spark plug and wiring/connector for cylinder 3 for damage, corrosion or oil intrusion
- Swap ignition coil from cylinder 3 with another cylinder and re-scan to see if misfire follows the coil
- Swap spark plug with another cylinder (or inspect/replace) and re-test
- Measure coil primary and secondary resistance and compare to specification
Signal parameters
- Coil primary voltage supply: battery voltage present at coil supply circuit (nominal ~12 V)
- Coil primary resistance (ohms) and secondary resistance (kΩ) — compare to OEM spec
- Ignition coil control signal from ECM: square wave/pulse presence, duty cycle and frequency (use oscilloscope)
- Misfire counters / cylinder-specific misfire rate from PCM (counts/min or events)
- Crankshaft/camshaft position sensor signal stability (RPM-synced pulses) and timing correlation
- Injector pulse width for cylinder 3 (ms) if fuel issue suspected
Diagnostic algorithm
- Read codes and freeze-frame; record vehicle conditions when P1339 set. Check for other related codes.
- Clear codes and perform key-on / engine run to see if fault returns; monitor live misfire counters and cylinder balance.
- Visually inspect coil 3, spark plug and harness/connector for damage, corrosion, oil or water ingress.
- Swap coil 3 with another cylinder's coil. If code/misfire follows the coil, replace the coil.
- If misfire remains on cylinder 3 after swapping coils, swap spark plugs or fit a new plug for cylinder 3 and re-test.
- Check wiring: back-probe coil 3 connector. Verify battery supply, ground continuity and ECM control pulse while cranking/idle.
- Use a scope or DVOM to confirm coil control waveform from ECM. Look for weak/absent control pulses or distorted waveform.
- Test injector for cylinder 3 (resistance and activation). Perform a balance/power balance test or use a noid light/oscilloscope on injector pulse if fuel issue suspected.
- If electrical checks pass, perform a compression or leak-down test on cylinder 3 to rule out mechanical causes.
- If wiring and mechanical checks are good, consider ECM/ignition driver fault or software update — consult technical service bulletins and dealer resources before replacing ECM.
- After repairs, clear codes and perform a road test and monitor for recurrence; confirm emissions and drivability restored.
Likely causes
- Ignition coil failure is most common
- Damaged coil harness connector or wiring
- Spark plug degraded or incorrect gap
- ECM ignition driver or software issue (less common)
- Cylinder-specific fuel injector fault or clogged injector
- Mechanical loss of compression (valve, piston, ring) is possible but less likely
Fault status
Status
P1339 — Ignition failure detected on cylinder 3 (misfire recorded). Check coil, spark plug, wiring and related systems.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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