OBD-II Code · Ignition
P0358
Ignition Coil H 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 8 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 8
- Check engine light
Likely causes
- Failed coil 8Most common
- Wiring
Read the full diagnostic procedureP0358 is the cylinder 8 ignition coil primary/secondary circuit fault — V8 (or larger).
P0358 is the cylinder 8 ignition coil primary/secondary circuit fault — V8 (or larger).
Cylinder 8 location
on Ford Modular V8 it's the rear cylinder of bank 2 (driver side, against the firewall), on GM LS V8 it's the rear cylinder of bank 2 (passenger side, against the firewall), on Chrysler Hemi it's the rear of bank 2 (passenger side), on BMW V8 it's bank 2 rear, on Mercedes V8 it's bank 2 rear. Cheapest-first diagnostic: swap the cylinder 8 coil with a known-good front-bank coil, clear codes, drive cycle. Code moves = $35-$150 coil swap. Code stays at cylinder 8 = trigger wire integrity (under 0.5 ohms ECM to coil), B+ feed check (12.0-12.6V static / 13.5-14.5V running), ground drop check (under 0.1V under load). Scope the trigger pulse. Cylinder 8 is almost always the most thermally abused coil on the engine — rear of the rear bank, packed against the firewall, sitting on top of the exhaust manifold heat plume — so coil failure here typically signals the rest of the set is within weeks of failing. On Ford 5.4L 3V and GM LS truck V8s, replace the full set if any one cylinder-7/8 coil fails on a high-mileage example; the labor to do them individually as they fail adds up to more than a complete set replacement.
Vehicle-specific patterns2004-2010 Ford 5.4L 3V cylinder 8 P0358 is the most thermally abused position on the Triton — driver bank rear under the cowl, TSB 08-7-6 coil/boot k…
- 2004-2010Ford 5.4L 3V cylinder 8 P0358 is the most thermally abused position on the Triton — driver bank rear under the cowl, TSB 08-7-6 coil/boot kit, and the cylinder 8 plug is the most likely to break off in the head if seized; budget for the Lisle 65600 broken-plug extractor and possibly head-off repair on early 2004 trucks ($30-$2,000 depending on how badly it breaks).
- 2005-2013GM 5.3L/6.0L LS truck cylinder 8 P0358 from D585 failure, swap to D514A.
- 2009-2015Cadillac CTS-V 6.2L LSA supercharged cylinder 8 P0358 from heat-soak — supercharged LS coils need OE GM part numbers, aftermarket fails fast.
- 2003-2010Hemi 5.7L cylinder 8 P0358 (passenger bank rear) from boot crack and harness chafing on exhaust crossover.
- 2008-2014BMW N63 twin-turbo V8 cylinder 8 P0358 — same N63 service action package applies; the turbos sit right next to bank 2 and cook coils 5-8.
- 2007-2014Lexus LS460/IS-F 5.0L 2UR-GSE cylinder 8 P0358 — Denso COP, OE only, and on the IS-F the rear coils need intake removal for proper access.
Estimated repair$35 (one coil) to $5,200 (broken plug + coil + head work on 5.4L 3V).
Look up another code
P0358 — frequently asked
What does a P0358 code mean?
Coil pack 8 fault.
What causes a P0358 code?
Common causes: Failed coil 8; Wiring.
What are the symptoms of a P0358 code?
Typical symptoms: Misfire cyl 8; Check engine light.
Is it safe to drive with a P0358 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 P0358 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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