P0356: Ignition Coil F Primary/Secondary Circuit Malfunction
The engine computer saw a problem in the control circuit for ignition coil F (usually cylinder 6). The coil may not be firing at all.
Green, yellow, red: three ways P0356 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Code set once after a car wash or heavy rain and the engine runs fine.
Schedule a repair
Engine runs rough or a misfire code is also set. Replace the coil or fix the connector soon.
Stop and get help
Flashing check engine light. Stop driving soon to protect the catalytic converter.
Symptoms you might notice
- Misfire on that cylinder
- Rough idle
- Check engine light
Common causes, cheapest first
- Loose or corroded coil connector
- Failed ignition coil
- Damaged wiring to the coil
- Engine computer driver fault (rare)
What you can check before calling
- Check that the coil connector is clicked in and not corroded
- Look for oil in the spark plug well
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: P0300–P0308 misfire codes, explained.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
More misfire & ignition codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0356 mean?
P0356 means "Ignition Coil F Primary/Secondary Circuit Malfunction". The engine computer saw a problem in the control circuit for ignition coil F (usually cylinder 6). The coil may not be firing at all.
Can I drive with code P0356?
It depends on what the vehicle is doing. Green: Code set once after a car wash or heavy rain and the engine runs fine. Yellow: Engine runs rough or a misfire code is also set. Replace the coil or fix the connector soon. Red: Flashing check engine light. Stop driving soon to protect the catalytic converter.
What causes P0356?
The most common causes are: loose or corroded coil connector; failed ignition coil; damaged wiring to the coil.
Is P0356 a serious code?
It can be. Flashing check engine light. Stop driving soon to protect the catalytic converter.
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