OBD codes / P0360
P0360
SeriousIgnition Coil J Primary/Secondary Circuit (Cylinder 10)
A V10 or V12 will idle deceptively well on one dead cylinder, but the raw fuel cylinder 10 passes into the exhaust is steadily overheating that bank's catalytic converter. Keep trips short and throttle light until repaired; a flashing check-engine light upgrades this from "soon" to "now."
What this code means
P0360 flags an open or short circuit on ignition Coil J, which fires cylinder 10 — so this code belongs to V10 and V12 engines only. On coil-on-plug systems the ECM commands each spark by switching the coil's primary winding and simultaneously checks the circuit's electrical response; when coil J's circuit doesn't respond like an intact circuit, this code sets. That makes it a wiring-and-coil fault by definition — a worn spark plug can cause a misfire, but it can't make the circuit read open or shorted. Work through the usual chain: the coil itself, its connector (loose, corroded, or knocked off during other service), the harness leg feeding it, the fuse supplying the coil bank, and finally — rarely — the ECM's driver for that coil. The lost spark on cylinder 10 usually brings the companion misfire code P0310 with it, and on a big multi-cylinder engine those stored codes may be more noticeable than the miss itself.
Symptoms you might notice
- Misfire on cylinder 10, often subtle at idle on a V10/V12
- Mild roughness or a faint rhythmic vibration
- Check-engine light — flashing when the misfire is active under load
- Fuel odor from the exhaust
- Slightly reduced power; P0310 typically stored alongside
What it costs to fix
Typical range: $70–$500 · about ~0.3–2.5 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| Ignition coil (single) | $30–$150 | ~0.3–1.5 hrs |
| Wiring or connector repair | $5–$50 | ~0.5–2 hrs |
| Spark plugs (while in there) | $20–$100 | ~0.5–1.5 hrs |
The coil is a routine part; the labor depends on how deeply cylinder 10 is buried under engine covers, intake plumbing, or cowl trim — common on V10/V12 packaging. Once access is gained, doing plugs and checking the adjacent coils on that bank in the same session spreads the access labor across more useful work.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0360 for my exact vehicle →
Frequently asked
Does the coil swap test work on a V10?
Yes, the logic is identical: move coil 10 to a neighboring cylinder, clear the codes, and drive. If the circuit code follows the coil to its new cylinder, the coil is bad; if P0360 stays on cylinder 10, dig into that cylinder's connector and wiring instead. The only extra work on a V10 is removing whatever covers hide the coils.
Is P0360 caused by a spark plug?
No — a spark plug can't open or short the coil's electrical circuit, which is what this code measures. The plug may still be worth replacing while you're in there, but the fault behind P0360 lives in the coil, its connector, its wiring, the coil fuse, or (rarely) the ECM driver.
Can I drive my V10 with P0360?
Gently and briefly, if the light is steady — the engine will run fine on nine cylinders, but the catalytic converter is absorbing the unburned fuel the whole time. If the light flashes, the converter is actively overheating: stop driving it hard and get the repair done promptly.
What does this cost to fix?
One coil is a modest part on any engine, including a V10. The bill is mostly labor for reaching the coil under the engine's covers and plumbing, plus diagnostic time if the fault turns out to be wiring. It remains far cheaper than the catalytic converter you risk by driving on the misfire.
Seeing P0360 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0360 for my vehicleRelated trouble codes
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Generic OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.