P0310 code: Cylinder 10 Misfire Detected
P0310 means cylinder 10 Misfire Detected. The code says where to look, not what failed — the fix depends on which cause your car actually has.
What P0310 means
P0310 flags a misfire in cylinder 10 — the cylinder isn't reliably burning its air-fuel mixture. Only engines with ten or more cylinders have a cylinder 10, so this code lives exclusively on V10 and V12 engines: heavy-duty trucks and vans on one end, luxury and performance cars on the other. As with any single-cylinder misfire, the odds-on causes are that cylinder's spark plug or ignition coil, confirmed by swapping the suspect part to a neighboring cylinder and seeing whether the misfire follows. A clogged or dead injector and low compression (valve or ring trouble) are the less common, more expensive possibilities. Note that a single misfiring cylinder on a 10- or 12-cylinder engine can feel surprisingly subtle — don't let the smoothness fool you, because the unburned fuel still punishes the catalytic converter.
P0310 symptoms
- Subtle roughness or vibration at idle
- Loss of power or hesitation under load
- Flashing check-engine light during an active misfire
- Reduced fuel economy
- Fuel smell from the exhaust in severe cases
What it costs to fix P0310
Varies by vehicle — get it diagnosed.
The repair cost for this code depends too much on your exact vehicle and the underlying cause to quote a meaningful range. Confirm the cause first so you only pay for the fix you actually need.
Diagnose P0310 for my vehicle →How to fix P0310
Moderate — doable at home with common tools and patience
- Find cylinder 10 on a diagram, then plan access
Cylinder 10 only exists on V10 and V12 engines, and its physical spot depends on the maker's numbering scheme. Once you know its bank and position, work out how to reach it — in full-size vans the rear cylinders are often easier to get at through the engine cover inside the cab than from under the hood.
- Rule out a bank-wide problem first
Scan for fuel-trim codes and misfire counts on the other cylinders before focusing on 10 alone. If the rest of that bank is also missing or running lean, look at a vacuum leak, intake gasket, or that bank's fuel supply rather than one plug or coil; if only cylinder 10 is counting, keep the search local.
- Swap the cylinder 10 coil or plug wire
Move the coil (or the plug lead, on V10s that use wires) from cylinder 10 to a smooth-running cylinder and recreate the conditions that set the code. When the miss follows to the new cylinder, you've found the part. In a dark garage, a fine water mist over the leads and boots at idle can reveal arcing you won't see in daylight — keep your hands clear while doing it.
- Read plug 10 and the boot that sits on it
Oil-wet threads on plug 10 point to a leaking valve cover or tube seal, a sooty tip suggests the cylinder is running rich, and an eroded center electrode simply means it's worn out. Check the boot for a white or black track down its side — that's spark escaping to ground — and renew the boot or coil along with the plug.
- Balance-test injector 10 and check compression
With ignition cleared, an injector balance test (or a simple swap with a neighbor on port-injected engines) shows whether injector 10 delivers its share. If fuel checks out too, compare cylinder 10's compression with the other nine or eleven; a low reading means a mechanical fault that needs a shop.
DIY or shop? Big V10 trucks and vans are workable for a patient DIYer: coils and plugs come out with ordinary hand tools, though van owners may spend more time removing the interior engine cover than doing the actual test. Twelve-cylinder cars push this toward the shop because of tight packaging and parts cost. Draw the line at injector removal on direct-injection engines, intake removal you aren't comfortable resealing, and any low compression reading — those take experience, special tools, or both.
Tools for the DIY steps: Scan tool with live misfire data · Spark plug socket and long extensions · Universal joint or swivel socket · Spray bottle for the arc check · Injector balance tester or noid light · Compression gauge
Not sure which step applies to your car? Get the likely cause for your exact vehicle before buying anything for P0310.
Start a case with P0310 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 P0310?
Redline can’t determine from a symptom or code alone whether your car is safe to drive.
P0310: common questions
What engines can actually set P0310?
Only engines with at least ten cylinders — V10s and V12s. If this code shows up on a four-, six-, or eight-cylinder engine, re-scan it: you're likely looking at a scan-tool misread or a spurious code, not a real cylinder 10.
Why does the misfire feel so mild?
With ten or twelve cylinders, losing one leaves plenty of smooth power, so the shake can be barely noticeable. The damage still accumulates, though — unburned fuel from the dead cylinder overheats the catalytic converter regardless of how smooth the engine feels.
Can I drive with P0310?
No code can answer that on its own. A flashing light means active catalyst-damaging misfire, so stop driving and get it seen promptly. Either way, schedule the diagnosis soon since misfires tend to worsen.
Should I replace all the plugs and coils at once?
Only cylinder 10's parts are required to fix P0310. That said, on high-mileage V10/V12 engines where access is laborious, some owners choose to do all plugs (and sometimes coils) in one visit to avoid paying the labor twice when the next one fails.
Related trouble codes
Don’t have a scanner yet? A ~$25 Bluetooth adapter reads codes like P0310 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 P0310 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.