P0361 code: Ignition Coil K Primary/Secondary Circuit (Cylinder 11)
P0361 means ignition Coil K Primary/Secondary Circuit (Cylinder 11). The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0361 means
Coil K serves cylinder 11, so P0361 is effectively a V12-family code — no ten-cylinder or smaller engine has a coil K to fault (a V10 tops out at coil J). The ECM fires each of the twelve coils by switching its primary winding and verifies the circuit electrically on every spark event; P0361 means coil K's primary or secondary circuit read open or shorted. It is an electrical failure, which separates it cleanly from a worn spark plug — a tired plug misfires without ever breaking the circuit. The realistic causes are a failed coil, a connector that has loosened or corroded, chafed wiring in that bank's harness, a blown fuse in the coil supply, and, rarely, the coil driver inside the ECM. Because a twelve-cylinder engine idles smoothly even with one cylinder down, the stored codes — this one plus companion misfire code P0311 — are often the clearest evidence that anything is wrong at all.
P0361 symptoms
- Cylinder 11 misfire — frequently subtle on a V12
- Faint idle unevenness or vibration under load
- Check-engine light; flashing during active misfire
- Fuel smell from the exhaust
- Marginal power loss; usually paired with P0311
What it costs to fix P0361
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 itself costs no more than any other coil — the expense on a V12 is access, since coils typically sit under engine covers in a tightly packaged bay, and labor rates at shops equipped for twelve-cylinder cars run higher. Bundling plugs and a coil-bank inspection into the same access session is usually the economical choice.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0361 for my exact vehicle →
How to fix P0361
Moderate — doable at home with common tools and patience
- Confirm a twelve-cylinder engine and find coil K
Coil K fires cylinder 11, so this code belongs to V12 and W12 engines only — a V10 stops at coil J. Use the numbering diagram for your exact engine to locate cylinder 11, and expect to remove engine covers or trim to reach the coils on many of these cars.
- Read both engine modules where fitted
Some twelve-cylinder engines run a separate engine module for each bank. Read both, note which one logged P0361, and check that the companion P0311 and any other coil codes report from the same side — that tells you which module and which half of the harness are involved.
- Check plug wear along with coil K
Worn plugs with wide gaps demand more voltage, which overworks coils until their windings fail — a frequent reason coils on long-interval engines keep dying. Pull plug 11, compare its gap and electrode wear with a new one, and if it's overdue, replace plugs with the coil so the new part isn't stressed the same way.
- Swap coil K and see where the fault goes
Put coil 11 on another cylinder and that cylinder's coil on 11, reset codes, and drive. If the new scan names the other cylinder's coil circuit, coil K is finished; if P0361 holds on cylinder 11, measure feed voltage and ground at its connector and check the trigger wire toward the module.
- Get module-level diagnosis if wiring tests good
A good coil, good supply, and intact trigger wire that still produce P0361 point toward the module's coil driver. These modules usually need coding or programming to the car after replacement, so confirm the diagnosis with a scope at a shop rather than swapping a module on suspicion.
DIY or shop? If the coils on your engine sit on top of the heads under removable covers, a careful owner can handle the scan, plug check, and swap test with hand tools and a capable scanner. The difficulty climbs fast where intake components have to come off, and twelve-cylinder coils and plugs are expensive enough that guessing hurts. A specialist shop should take over for harness tracing, anything involving the engine modules, and any car where reaching cylinder 11 means significant disassembly.
Tools for the DIY steps: Scanner that reads both engine modules · Trim removal tools · Spark plug gap gauge · Digital multimeter · Torque wrench
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0361.
Start a case with P0361 and your car. Redline weighs these causes against what your car shows, and names the check that would settle it before you buy parts.
Can I drive with P0361?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0361: common questions
Should all twelve coils be replaced when one fails?
Not automatically. If the swap test pins the fault on coil 11, one coil is a complete repair. On a high-mileage V12 where access labor dominates the bill, replacing coils in sets (or at least the same bank) can be sensible economics — but that's a cost-of-labor decision, not a technical necessity.
My car only has 6 cylinders — why am I seeing P0361?
You shouldn't be. Coil K corresponds to cylinder 11, which only exists on twelve-cylinder engines. A P0361 reading on a smaller engine almost certainly means a scan-tool misread or a garbled code — rescan with a different tool before chasing a phantom fault.
What will fixing P0361 cost?
The part is ordinary — an ignition coil is a modest component even for a V12. The real cost is labor to reach it under the engine covers and, if the fault is wiring, the diagnostic time to trace it. Doing plugs and inspecting neighboring coils during the same teardown stretches that labor further.
Can I drive with P0361?
Not something a code can answer by itself. Eleven cylinders may keep the engine running, but every mile feeds unburned fuel to a catalytic converter that's expensive to replace on a twelve-cylinder car. Get it repaired promptly, and stop driving if the light flashes.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0361 from your phone. See our guide to the best OBD2 Bluetooth adapters. Run a repair shop? See Redline for shops.
Generic OBD-II reference. Manufacturer-specific behavior varies. Confirm with a scan tool and, for safety-related codes, a professional inspection. Cost ranges are reference ranges, not quotes.
Seeing P0361 on your car?
Every problem becomes a Case. Tell Redline what the car is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.