OBD-II Code · Ignition
P0359
Ignition Coil I Primary/Secondary Circuit
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$40–$4,800
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Cylinder 9 coil fault — V10 engines only.
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 9
- Check engine light
- Reduced power
Likely causes
- Failed COPMost common
- Heat-soak degradation
- Harness chafe
Read the full diagnostic procedureP0359 is the cylinder 9 ignition coil primary/secondary circuit fault — this code only appears on V10 engines (Dodge Viper 8.0/8.4L V10, Ford 6.8L V1…
P0359 is the cylinder 9 ignition coil primary/secondary circuit fault — this code only appears on V10 engines (Dodge Viper 8.0/8.4L V10, Ford 6.8L V10 Triton in Super Duty trucks, BMW S85 5.0L V10 in M5/M6, Lamborghini Gallardo/Huracan V10, Audi R8 V10 / RS6 V10).
Cylinder 9 location
on Ford 6.8L V10 it's the third cylinder on bank 2 (passenger side rear-middle), on Dodge Viper V10 it's typically the front of the right bank in the 1-10 numbering, on BMW S85 V10 it's bank 2 second position. Cheapest-first diagnostic: swap the cylinder 9 coil with a known-good coil of the same part number from a front-bank position, clear codes, drive cycle. Code follows = $40-$300 coil replacement (Ford 6.8L truck coils are cheap, BMW S85 and Lamborghini coils are not). Code stays at cylinder 9 = standard trigger wire / B+ feed / ground check, scope the trigger pulse for clean 0-5V or 0-12V square-wave at 3-6ms dwell. On BMW S85 and exotic V10s, do NOT guess on coils — these engines have tight coil specs and aftermarket parts cause cascading misfires; OE only, full-set replacement is standard practice on S85 above 60K miles.
Vehicle-specific patterns2005-2010 Ford F-250/F-350 6.8L V10 Triton 3V cylinder 9 P0359 — same TSB 08-7-6 family covers V10 Tritons; the rear-bank coils on the V10 are the mo…
- 2005-2010Ford F-250/F-350 6.8L V10 Triton 3V cylinder 9 P0359 — same TSB 08-7-6 family covers V10 Tritons; the rear-bank coils on the V10 are the most heat-soaked and most likely to fail first on towing-duty trucks.
- 2006-2010BMW M5/M6 E60/E63 S85 5.0L V10 cylinder 9 P0359 from coil failure — S85 coils are batch-failure platform, and BMW recommends full-set replacement at any single-coil failure above 60K miles; rod bearings are the other S85 sword-of-Damocles, so a P0359 on a high-mileage S85 should trigger a rod-bearing inspection conversation.
- 2008-2014Audi R8 V10 / 2009-2012 Lamborghini Gallardo LP560 V10 cylinder 9 P0359 — coils share with the Audi 4.2 V8 family, but access on the R8 requires rear-clip drop ($800-$1,500 labor before parts).
- 2003-2017Dodge Viper 8.3/8.4L V10 cylinder 9 P0359 from aging Bosch coil packs — Viper V10 is firing-order 1-10-9-4-3-6-5-8-7-2 and cylinder 9 sits on the driver bank middle.
Estimated repair$40 (Ford 6.8L V10 single coil) to $4,800+ (BMW S85 full coil set + plugs + valve cover gaskets).
Look up another code
P0359 — frequently asked
What does a P0359 code mean?
Cylinder 9 coil fault — V10 engines only.
What causes a P0359 code?
Common causes: Failed COP; Heat-soak degradation; Harness chafe.
What are the symptoms of a P0359 code?
Typical symptoms: Misfire cyl 9; Check engine light; Reduced power.
Is it safe to drive with a P0359 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $40-$4,800.
How do I diagnose a P0359 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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