P0314

Single Cylinder Misfire (Cylinder not Specified)

Ignition / misfire Generic OBD-II High

What it means

P0314 means the engine detected a misfire on one cylinder, but the system did not (or could not) pin down which one. Fuel isn't burning properly in that cylinder, so the engine runs rough and loses power. Like other misfire codes it matters: sustained misfiring can overheat and destroy the catalytic converter.

High

Can I keep driving? Drive as little as possible — an active misfire can overheat and damage the catalytic converter, especially if the light is flashing.

Real-world scan data

Seen in

642

scans in the past year

Found in

0.1%

of scans

0.2%

of scans that found faults

Appears alongside · share of P0314 scans

P2119in 90.5% of scans

P0130in 81.8% of scans

P0420in 80.1% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on (may flash during an active misfire)
Rough idle, shaking, or stalling
Reduced power and hesitation on acceleration
Increased fuel consumption

Common causes

Most likely first

Worn spark plug or failing ignition coil on one cylinderLikely
Clogged or leaking fuel injectorCommon
Vacuum leak affecting one cylinderCommon
Low compression or a valvetrain problem in that cylinderLess often
ECM or wiring fault (less common)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and look for a companion cylinder-specific code (P0301–P0312) to identify the miss.
Inspect and swap the spark plug and coil into another cylinder to see if the misfire follows.
Check fuel delivery for that cylinder — injector operation and fuel pressure.
Test for a vacuum leak around the intake.
If it persists, run a compression test to rule out a mechanical fault. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0314?+

No — a live misfire dumps unburned fuel into the exhaust and can quickly ruin the catalytic converter. Keep driving to a minimum.

Can I just clear P0314?+

It comes back within a few drive cycles until the misfiring cylinder is repaired.

Read & clear P0314 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX