P0312 — Cylinder 11 Misfire Detected
Drivable short-term, but fix now to avoid damage.
What P0312 means
This code means your engine's computer detected a misfire in cylinder 11, so that cylinder isn't burning its fuel-air mixture the way it should. Common causes include worn spark plugs, a failing ignition coil, a clogged injector, or low compression. The fix usually begins with replacing spark plugs and coils, and it's a common repair that's often manageable without major engine work.
Common symptoms
- Check engine light is on or flashing
- Rough idle or noticeable shaking
- Loss of power when accelerating
- Engine stumbling or hesitation
- Reduced fuel economy
Common causes
- Worn or fouled spark plug on cylinder 11
- Faulty ignition coil for cylinder 11
- Clogged or failing fuel injector
- Vacuum leak or low compression in the cylinder
- Damaged spark plug wires or connectors
Typical repair cost
$150 – $1200
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0312 code?
Only briefly if there's no other option. A misfire can damage your catalytic converter and get worse fast, especially with a flashing light. Have it diagnosed promptly.
How much does it cost to fix a P0312 code?
Repairs generally run $150 to $1,200. Spark plugs and coils are cheaper, while injector or compression problems push costs higher.
Is a P0312 code serious?
Yes. A persistent misfire reduces power, wastes fuel, and can damage costly emissions components. A flashing check engine light makes it urgent.
What engines even have a cylinder 11?
Cylinder 11 is found only on large engines like V12s, common in some luxury and exotic vehicles. Parts and labor can be expensive, so a careful diagnosis before replacing components is worth it.