Quick answer: The P0313 code indicates a Misfire Detected with Low Fuel. It affects the engine management and fuel delivery systems. This code is moderately urgent because running an engine while low on fuel can cause misfires that damage your catalytic converter. You should address this issue immediately to prevent expensive exhaust system repairs.
Seeing a Check Engine Light can be stressful, especially when it points toward a fuel-related issue like the P0313 code. This guide explains why your car is reporting a misfire due to low fuel levels, how to troubleshoot the potential culprits, and what steps you should take to resolve the problem effectively.
What Does P0313 Mean?
The P0313 diagnostic trouble code is triggered when the Engine Control Module (ECM) detects an engine misfire while the fuel level is critically low. Essentially, the car’s computer senses that the fuel pump is struggling to deliver a consistent supply of gasoline to the injectors. This leads to an air-fuel mixture that is too lean, causing the engine to skip combustion cycles. While the code specifically highlights the low fuel level, it also serves as a warning that the engine is not running optimally.
Symptoms
- Check Engine Light illumination on the dashboard.
- Noticeable engine hesitation or stuttering during acceleration.
- Rough idling when the vehicle is stopped.
- Decreased fuel economy.
- Engine stalling, particularly when cornering or accelerating.
- A flashing Check Engine Light, indicating an active, severe misfire.
Possible Causes
Many owners make the mistake of immediately replacing the fuel pump or fuel injectors. Before spending money on expensive components, consider that the issue is often related to the fuel supply reaching the engine during low-level conditions.
- Low fuel level in the tank (often the simplest cause).
- Clogged fuel filter restricting flow.
- Failing fuel pump that cannot maintain pressure at low levels.
- Faulty fuel level sensor providing inaccurate data to the ECU.
- Vacuum leaks in the intake system causing lean conditions.
- Worn-out spark plugs or ignition coils failing under low-pressure stress.
Check These Yourself Before Visiting a Mechanic
- Fill your gas tank completely to see if the misfire and the warning light disappear after a few drive cycles.
- Inspect the fuel cap to ensure it is tightened properly, as a loose cap can affect fuel system pressure.
- Check your recent fuel receipts to see if you recently filled up with poor-quality or contaminated fuel.
How to Fix It
- Refuel the vehicle immediately and drive it to see if the computer clears the fault code.
- Test the fuel pressure using a diagnostic gauge to ensure the fuel pump is meeting manufacturer specifications.
- Inspect and replace the fuel filter if it is past its service interval.
- Test the fuel level sensor to ensure the gauge is reading correctly.
- Perform a scan for secondary codes, such as those related to ignition coils or sensors, to rule out electrical faults.
Estimated Repair Costs (2026)
| Job | Parts ($) | Labor ($) |
|---|---|---|
| Fuel Filter Replacement | 30 – 80 | 50 – 150 |
| Fuel Pump Diagnosis | N/A | 100 – 200 |
| Fuel Pump Replacement | 150 – 500 | 200 – 600 |
| Spark Plug Set | 40 – 120 | 80 – 200 |
Note: these are 2026 estimates in US dollars; costs vary by make and model.
Frequently Asked Questions
Can I drive with the P0313 code?
You should avoid driving the vehicle if the light is flashing, as this indicates a severe misfire that can destroy your catalytic converter. If the light is steady, you should refuel immediately and drive cautiously to a repair shop for diagnosis.
How do I clear the P0313 code?
The code will often clear itself after several successful ignition cycles once the fuel level is replenished and the misfire condition is resolved. You can also use an OBD-II scanner to clear the code manually, but it will return if the underlying cause is not fixed.
Is the fuel pump always the problem?
No. While a failing fuel pump is a common cause, the P0313 code is often triggered simply by driving on “E” or having a faulty fuel level sender that makes the car think it has less fuel than it actually does. Always verify fuel pressure before replacing the pump.