OBD-II Code · Ignition
P0356
Ignition Coil F Primary/Secondary Circuit
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$80–$300
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Coil pack 6 fault.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Misfire cyl 6
- Check engine light
Likely causes
- Failed coil 6Most common
- Wiring
Read the full diagnostic procedureP0356 is the cylinder 6 ignition coil primary/secondary circuit fault — V6, V8, V10, or inline-6 engine.
P0356 is the cylinder 6 ignition coil primary/secondary circuit fault — V6, V8, V10, or inline-6 engine.
Cylinder 6 location
on a V6 (Toyota 2GR, Nissan VQ35, GM 3.6, Ford Cyclone 3.5/3.7) it's the rear-bank rear cylinder (firewall side, hardest to reach), on Ford Modular V8 it's bank 2 second from front, on GM LS V8 it's bank 2 middle-front, on Chrysler Hemi it's bank 2 second position, on BMW/Mercedes inline-6 it's the firewall-end cylinder. Cheapest-first diagnostic: swap the cylinder 6 coil with cylinder 2's (V8) or cylinder 1's (V6 — pull a front-bank coil that's easy to reach), clear codes, drive cycle. Code moves with coil = $35-$120 fix. Code stays at cylinder 6 = the standard trigger-wire/power/ground diagnosis. On rear-bank rear-cylinder V6 positions, this is the heat-soak grave — engine bay temps under load can hit 220-260F on the firewall side, and coils degrade fastest here. Don't condemn the ECM until you've swapped a known-good coil in and confirmed clean trigger wire + clean power + clean ground; rear-bank harness wear on V6s commonly chafes against the firewall or transmission bellhousing.
Vehicle-specific patterns2007-2014 Nissan Altima/Maxima/Murano 3.5L VQ35DE cylinder 6 P0356 is the textbook VQ35 case — rear bank rear cylinder, valve cover gasket oil leak i…
- 2007-2014Nissan Altima/Maxima/Murano 3.5L VQ35DE cylinder 6 P0356 is the textbook VQ35 case — rear bank rear cylinder, valve cover gasket oil leak is the standard root cause, and replacing the coil without also replacing the rear valve cover gasket guarantees a return visit.
- 2007-2017Toyota Camry/Avalon/Highlander 3.5L 2GR-FE cylinder 6 P0356 from Denso COP failure under the intake plenum — plenum removal required, budget for plenum gasket.
- 2007-2013BMW N52/N54 cylinder 6 P0356 from Eldor coil batch failure — replace all six on this engine because the rest are days behind.
- 2011-2019Ford F-150 3.5L EcoBoost cylinder 6 P0356 from carbon-fouled plug + heat-soaked coil; carbon walnut-blast service ($300-$500) every 60-80K miles prevents recurrence.
- 2005-2013GM 5.3L LS truck cylinder 6 P0356 from D585 failure.
- 2003-2010Hemi 5.7L cylinder 6 (passenger bank middle) P0356 from boot crack under exhaust heat.
Estimated repair$35 (one coil) to $850 (full coil set + plenum gasket + valve cover gaskets on VQ35).
Look up another code
P0356 — frequently asked
What does a P0356 code mean?
Coil pack 6 fault.
What causes a P0356 code?
Common causes: Failed coil 6; Wiring.
What are the symptoms of a P0356 code?
Typical symptoms: Misfire cyl 6; Check engine light.
Is it safe to drive with a P0356 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $80-$300.
How do I diagnose a P0356 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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