P0314 code meaning
Single Cylinder Misfire (Cylinder Not Specified)
Powertrain system Generic code P03xx codes Check engine light
What P0314 means
P0314 means the misfire is attributable to a single cylinder, but the module does not say which one. CARB generally requires cylinder-specific codes and allows a general code only with approval where the cylinder cannot be identified reliably; for diesels identification is required only where possible without extra hardware. GM and Ford do not use P0314. It is documented on Saab's 2.2 TiD diesel with a Bosch distributor pump, as a mechanical misfire fault in two speed and quantity windows with the warning light and limp mode limiting injection quantity; the cylinder can still be read out with a scan tool. Typical causes are a faulty injector, leaking high-pressure lines, air or water in the fuel, or low compression.
P0314 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P0314
- Check engine light on
- Loss of power, limp mode with quantity limit (Saab diesel)
- Rough running, vibration
Common causes of P0314
- Most likelyInjector of one cylinder clogged or leaking (diesel), or coil/plug (gasoline)
- PossibleLeaking high-pressure line, fuel bridge or injector washer
- PossibleAir, water or gasoline in the diesel, clogged filter, low supply pressure
- Less likelyCompression loss (valve, piston)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel injectorsHigh pressure linesIgnition system
What each part of P0314 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 3 | Area: ignition system or misfire. |
| 14 | The exact fault in that area. |
What to do next
- Note P0314 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0314
What does P0314 mean?
P0314 means "Single Cylinder Misfire (Cylinder Not Specified)". P0314 means the misfire is attributable to a single cylinder, but the module does not say which one. It is a generic code, so it means the same on every make.
Is it safe to drive with P0314?
Drive gently and only to a workshop. With P0314 the car can go into limp mode (reduced power) to protect itself.
Will P0314 fail an emissions test?
Yes, it can. P0314 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0314 to fix?
Difficulty: hard. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0314 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.