OBD-II Code · Ignition
P0354
Ignition Coil D 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 4 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
- Check engine light
Likely causes
- Failed coil 4Most common
- Wiring
Read the full diagnostic procedureP0354 is the cylinder 4 ignition coil primary/secondary circuit fault.
P0354 is the cylinder 4 ignition coil primary/secondary circuit fault.
Cylinder 4 location
on inline-4 engines cylinder 4 is the flywheel-end cylinder (opposite the timing belt/chain), on Ford Modular V8 it's the rear cylinder of bank 1 (passenger side), on GM LS V8 it's the rear cylinder of bank 1 (driver side), on Chrysler Hemi it's bank 1 rear, on BMW inline-6 it's the middle of the engine block, on Toyota 2GR V6 it's the rear bank middle. Cheapest-first diagnostic: same pattern as P0351-P0353 — swap the cylinder 4 coil with a known-good neighbor, clear codes, drive cycle, watch where the code goes. If the code moves with the coil, $35-$120 fix. If P0354 stays at cylinder 4, the issue is on the cylinder-4 side: trigger wire integrity (ECM to coil under 0.5 ohms), B+ feed at the connector (12.0-12.6V static, 13.5-14.5V running), ground integrity (under 0.1V drop coil-ground-to-battery-negative under load). Scope the trigger pulse — clean 3-6ms dwell square wave at idle, RPM-following. On rear-bank/rear-cylinder positions like this one, heat soak is the cumulative killer — coils that test fine cold and fail hot are the rule, not the exception, on Ford and Toyota V8s.
Vehicle-specific patterns2004-2010 Ford 5.4L 3V cylinder 4 P0354 is the rear-passenger cylinder under the cowl — it's the hardest plug/coil to physically reach (intake manifo…
- 2004-2010Ford 5.4L 3V cylinder 4 P0354 is the rear-passenger cylinder under the cowl — it's the hardest plug/coil to physically reach (intake manifold removal recommended on Expedition/Navigator) and the most heat-soaked, so it's often the first to fail in a set. TSB 08-7-6 still applies.
- 2005-2014Toyota Tundra/Sequoia 5.7L 3UR-FE cylinder 4 P0354 — Denso COPs are durable but the rear-bank cylinder 4 position cooks under sustained towing; OE Denso replacement only.
- 2005-2013GM 5.3L LS truck cylinder 4 P0354 from D585 failure, D514A is the updated part.
- 2007-2014Nissan VQ35 cylinder 4 P0354 from rear-bank coil and valve cover gasket — VQ35 rear-bank service requires partial intake removal.
- 2003-2010Chrysler 5.7L Hemi cylinder 4 (passenger bank rear) P0354 from worn coil boots cracking under exhaust manifold heat — Hemi coils sit between two exhaust manifolds and run hot.
- 2002-2008Ford Ranger/Mustang 4.0L SOHC V6 cylinder 4 P0354 from cracked coil-on-plug body and chafed harness over the rear bank.
Estimated repair$35 (one coil) to $600 (full coil set + intake gaskets on a Tundra).
Look up another code
P0354 — frequently asked
What does a P0354 code mean?
Coil pack 4 fault.
What causes a P0354 code?
Common causes: Failed coil 4; Wiring.
What are the symptoms of a P0354 code?
Typical symptoms: Misfire; Check engine light.
Is it safe to drive with a P0354 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 P0354 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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