Skip the auto shop - Our mechanics make house calls

P0314 OBD-II Trouble Code: Single Cylinder Misfire (Cylinder not Specified)

Check Engine Light

P0314 code definition

A P0314 trouble code indicates that the Powertrain Control Module (PCM) has detected an engine misfire in a single cylinder that was powerful enough to damage the catalytic converter. In conjunction with the storage of the trouble code, the Check Engine light usually comes on. In cases where the misfire was not serious enough to cause damage to the catalytic converter, the Check Engine light might flash momentarily, while accelerating, before going off.

The PCM might also store related trouble codes dealing with individual cylinders, including a P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0309, P0310, P0311, P0312, and P0313 trouble code.

What the P0314 code means

A P0314 trouble code means the engine has suffered a misfire in a non-specified cylinder. The PCM uses the position of the crankshaft, along with the camshaft position and the RPMs of the engine to detect a misfire.

What causes the P0314 code?

A P0314 trouble code can have many causes, including:

  • Insufficient fuel pressure leading to a lean condition
  • Excessive vacuum leaks within the engine
  • A malfunction in the EGR system
  • A clogged catalytic converter
  • A failure in the ignition system

What are the symptoms of the P0314 code?

Common symptoms of a P0314 trouble code include a reduction in power, rough idling, and irregular acceleration, in addition to the stored trouble code and the Check Engine light illuminating.

How does a mechanic diagnose the P0314 code?

To diagnose a P0314 trouble code, a mechanic needs an advanced scanner or code reader, factory service manual, and a digital volt/ohmmeter. In addition to these tools, the mechanic should perform the following steps:

  • Visually inspect all wiring, connectors, and components.

  • After making all of the necessary repairs to the wiring, connectors, and components, retest the system to ensure that the problem has been fixed.

  • Clear the P0314 trouble code and test drive the vehicle.

  • If a code has been stored, but no symptoms are present, reset the PCM to see if the code returns.

  • If the engine continues to hesitate upon acceleration, check that the vehicle is up to date on all maintenance, including tune-ups.

  • If the ignition system has no problems and the engine continues to hesitate upon acceleration, inspect data from the oxygen sensor.

  • Inspect the vacuum hoses to look for a possible leak there.

  • Check the EGR valve to make sure it is still working properly.

  • Inspect the catalytic converter to see if it is clogged.

Common mistakes when diagnosing the P0314 code

One common mistake that mechanics make when dealing with a P0314 trouble code is replacing ignition system components, thinking the problem is there without inspecting the system. While possible, most ignition misfires fall within the P0301 to P0312 trouble code range.

How serious is the P0314 code?

The storing of a P0314 trouble code means that the engine misfire is severe enough to damage the catalytic converter, and if left unfixed, could lead to an increase in vehicle emissions. In addition, engine misfires that lead to a stored P0314 trouble code impact vehicle performance, including during acceleration and idling.

What repairs can fix the P0314 code?

To repair and clear a P0314 trouble code, the mechanic should perform the following:

Need help with a P0314 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Post a question and get free advice from our certified mechanics.

ASK A QUESTION

More related articles

P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem What the P0121 code means P0121 is a generic OBD-II code which indicates that the Engine Control...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222 code means The manufacturer specifies a range of acceptable voltage to be produced from the throttle position...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...


Related questions

Q: No throttle response on 2012 dodge avenger

In the future, please include the motor size. Thanks. Your electronic throttle system consists of the throttle pedal assembly with an accelerator pedal position sensor, the throttle body which consist of a TPS (Throttle Position Sensor), throttle plate actuator,...

Q: transmission control system mil request

The P0700 code signals that the transmission control module requested for the engine control module (ECM) to turn on the Check Engine Light. The ECM controls when the light is turned on. There may be another code besides the P0700...

Q: My mpv gave a code Shift Solenoid Stuck On just replaced solenoid a and b still dont work . wont drive

Return the vehicle to the shop that replaced the shift solenoids and have them check again. Most reputable shops provide a brief warranty on their repairs. If the repair was made by you, double check all the electrical connectors, on...