What P0313 means
P means powertrain (engine and transmission). The 0 marks a generic code defined by SAE, so the same number means the same thing across makes. The third character, 3, places it in the ignition system or misfire subsystem; the last two digits identify the specific fault.
The engine computer detects misfires by watching tiny changes in crankshaft speed: each cylinder that fires properly gives the crank a push, and one that does not shows up as a momentary slowdown. It counts misfires per cylinder and sets a code when the rate is high enough to raise tailpipe pollution or risk the catalytic converter.
What “Misfire with Low Fuel” means here
Misfires were detected while the fuel level was low. The module records the fuel level because running the tank low can starve the pump during cornering or on slopes; refill and see whether the code returns before chasing ignition faults.
What you may notice
Symptoms depend on the vehicle and on how the module responds to the fault. Any of these can accompany P0313:
- Shaking or rough running, often worst at idle or under load
- A flashing check engine light during severe misfiring
- Loss of power and hesitation
- Fuel smell from the exhaust
Where to start diagnosing P0313
- Start with ignition: inspect the spark plug and coil for the cylinder concerned, and swap the coil with a neighbouring cylinder to see if the misfire moves.
- Then fuel: check the injector connector and resistance, and swap injectors if practical.
- Then mechanical: a compression or leak-down test identifies valve, ring or head gasket problems.
- Check for vacuum leaks near the affected cylinder's intake runner.
Clear the code only after recording freeze frame data: it shows the engine speed, load and temperature at the moment the fault set, which is often the best clue to reproducing it.
Live data to watch
These standard OBD2 values relate to P0313. Support varies by vehicle; a value your car does not report will simply be missing.
| Value | What to look for |
|---|---|
| Engine RPM (PID 0x0C) | Unstable idle speed. |
| Misfire counts | Per-cylinder counts are available through Mode 06 on many vehicles. |
| Short and long term fuel trim (PIDs 0x06–0x09) | A lean bank points to a vacuum leak or fuel delivery issue. |
Related codes
Codes from the same misfire monitor family. If several are stored together, the shared part — wiring, a common reference voltage, or the component itself — is the place to start.
| Code | Definition |
|---|---|
| P0300 | Random or Multiple Cylinder Misfire Detected |
| P0309 | Cylinder 9 Misfire Detected |
| P0310 | Cylinder 10 Misfire Detected |
| P0311 | Cylinder 11 Misfire Detected |
| P0312 | Cylinder 12 Misfire Detected |
| P0314 | Single Cylinder Misfire (Cylinder not Specified) |
| P0316 | Engine Misfire Detected on Startup (First 1000 Revolutions) |
| P0363 | Misfire Detected - Fueling Disabled |
Further reading
Frequently Asked Questions
What does P0313 mean?
P0313 is the generic SAE J2012 code for "Misfire Detected with Low Fuel". In plain terms, it means the engine computer's misfire monitor monitor has reported "Misfire Detected with Low Fuel".
Can I keep driving with P0313?
If the check engine light is flashing, reduce speed and load and get the car looked at: unburnt fuel can overheat and destroy the catalytic converter.
What should I check first for P0313?
Start with ignition: inspect the spark plug and coil for the cylinder concerned, and swap the coil with a neighbouring cylinder to see if the misfire moves.
Definition source: SAE J2012 / ISO 15031-6 generic DTC definitions. This is the generic meaning that applies across makes; a manufacturer can define a code more narrowly or add its own sub-codes, so confirm against the service information for your vehicle before replacing parts. Written by the OBDAssistant engineering team — see our editorial policy.