Code
P1339
DS
P — Powertrain
Cylinder 3 ignition fail malfunction
Views:
UK: 0
EN: 2
RU: 4
AI status
Completed
Completed
100%
Causes
- Failed ignition coil (coil pack or coil-on-plug) on cylinder 3
- Worn, fouled, damaged or incorrect spark plug in cylinder 3
- Open, shorted or corroded wiring or connector for coil or spark plug sensor on cylinder 3
- Faulty fuel injector or fuel delivery issue at cylinder 3
- Low compression or mechanical issue in cylinder 3 (valve, piston, ring)
- Crankshaft/camshaft position sensor or timing/ synchronization fault
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or vibration at idle
- Reduced engine power, hesitation or poor acceleration
- Increased fuel consumption and higher emissions
- Possible hard start or stumble on takeoff
- Misfire counters or misfire-related freeze-frame data for cylinder 3
What to check
- Read stored and pending codes and view freeze-frame/live data with a diagnostic scanner
- Check misfire counters and which drive cycles triggered the code
- Visual inspection of ignition coil, spark plug and harness for damage, corrosion or oil contamination
- Measure coil primary and secondary resistance and compare to specifications
- Swap cylinder 3 coil with another cylinder and see if code/fault follows the coil
- Inspect and test the spark plug (gap, deposit, condition) and replace if doubtful
Signal parameters
- Ignition coil primary resistance (ohms) and secondary resistance (kΩ)
- Primary coil voltage and current during crank/run (V, A)
- Secondary ignition waveform shape and peak voltage (oscilloscope)
- Misfire counts per cylinder and misfire rate
- Crankshaft position sensor signal and cam/crank correlation
- Injector pulse width and commanded injector duty
Diagnostic algorithm
- Connect a scan tool, record freeze-frame and live data, note misfire counts and related codes.
- Visually inspect coil, plug, wiring and connector for cylinder 3. Repair any obvious damage or corrosion.
- Swap the cylinder 3 ignition coil with a known-good coil from another cylinder, clear codes, then run engine to see if fault follows the coil.
- Remove and inspect the spark plug from cylinder 3; check gap and condition. Replace plug if worn or fouled and retest.
- Measure coil primary and secondary resistance and compare to OEM specs. If out of range, replace coil.
- If coil and plug appear good, check injector operation for cylinder 3 (electrical continuity, activation, and spray if accessible).
- Use an oscilloscope to inspect primary and secondary ignition waveforms and verify crank/cam sync; look for weak spark, shorted turns, or mis-timed events.
- Check fuel pressure and perform a compression or leak-down test to rule out mechanical causes if electrical/ignition tests are normal.
- Inspect related engine grounds and battery/charging system. Repair wiring harness or connector faults as needed.
- If all components and wiring test good, consider ECU/ignition driver module diagnosis or replacement as a last step.
- After repairs, erase codes and road test to confirm the fault is cleared and no new misfire codes appear.
Likely causes
- Ignition coil failure on cylinder 3 (most common)
- Damaged or aged spark plug at cylinder 3
- Connector/wiring fault at coil harness (corrosion, broken wire, poor pin contact)
- Fuel injector malfunction or injector electrical fault for cylinder 3
Fault status
Status
Manufacturer-specific code P1339: Cylinder 3 ignition failure/malfunction detected. MIL set and misfire recorded for cylinder 3. Freeze-frame and live data available for diagnosis.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email