Misfire Detected with Low Fuel
Diagnostic trouble code P0313 indicates that the engine control module (ECM) detected an engine misfire while the vehicle's fuel level was critically low. The computer sets this specific code to distinguish a fuel starvation misfire from a mechanical or ignition-related misfire.
While driving with a misfire can damage the catalytic converter, this code is often resolved simply by adding fuel. However, if the tank is full and the code persists, it requires prompt diagnosis to prevent stalling.
Common symptoms
- Illuminated Check Engine Light
- Engine hesitation or stumbling
- Rough idle
- Engine stalling
- Low fuel warning indicator illuminated
Likely causes
- Critically low fuel level in the gas tank
- Faulty fuel level sensor or sending unit
- Weak or failing fuel pump
- Clogged fuel filter
- Restricted fuel injectors
What to check before replacing parts
Verify the actual fuel level in the tank and add fuel if necessary.
Look for: If the tank is nearly empty, adding fuel and clearing the code should resolve the issue.
Monitor the fuel level sensor data using a scan tool.
Look for: Compare the scan tool fuel level percentage to the dashboard gauge and actual tank volume; erratic or incorrect readings indicate a faulty sending unit.
Check for other stored diagnostic trouble codes.
Look for: Look for primary misfire codes (P0300-P0308) or fuel pressure codes that might indicate a broader ignition or fuel delivery problem.
Perform a fuel pressure test at the fuel rail.
Look for: Pressure that falls below the manufacturer's specification indicates a weak fuel pump, clogged filter, or failing fuel pressure regulator.
Inspect the fuel pump wiring and connectors.
Look for: Look for corrosion, melted pins, or loose connections that could cause intermittent voltage drops to the fuel pump.
This page explains the generic P0313 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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