P0314

Single Cylinder Misfire (Cylinder not Specified)

Severity: High
Driving: Short journeys only

A single cylinder is misfiring, but the control module cannot tell which one. This usually appears on engines where the module lacks the sensor resolution to identify individual cylinders, so it reports the fault without naming the culprit. Treat it as a single-cylinder misfire that you have to locate yourself.

Possible causes

CommonWorn or fouled spark plug on one cylinder
CommonFailed ignition coil on one cylinder
PossibleFaulty fuel injector on one cylinder
PossibleLow compression on one cylinder

What you might notice

Engine shakes at idle
Loss of power
Check engine light on

What to check, in order

Pull and inspect all the spark plugs. The odd one out - oil fouled, carbon black, or visibly different from the rest - identifies the cylinder.
With the engine running, feel each exhaust pulse or use a temperature reading at the manifold. A cold runner marks a dead cylinder.
Once you know which cylinder, treat it as a single-cylinder misfire and work through coil, plug, injector, compression in that order.

Read this code from your own car

Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.

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Where this code sits

B · Body C · Chassis P · Powertrain U · Network and communication

Ignition system or misfire