Misfire Detected with Low Fuel
P0313 indicates that the engine control module (ECM) has detected a misfire condition while the fuel level is low. This typically occurs when the fuel pump picks up air or debris due to insufficient fuel in the tank, causing a lean air-fuel mixture and incomplete combustion. The code is often triggered during low fuel conditions and may be accompanied by other misfire codes.
1. Most Common Causes
- Low fuel level allowing air into the fuel system
- Contaminated or stale fuel
- Faulty fuel pump or fuel pressure regulator
- Clogged fuel filter or injectors
2. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced engine power or hesitation
- Poor fuel economy
3. Step-by-Step Diagnosis
Step 1: Check fuel level and add fuel if low; clear codes and test drive.
Step 2: Inspect fuel system for leaks, contamination, or air intrusion.
Step 3: Test fuel pressure and volume; replace fuel filter if clogged.
Step 4: Scan for additional misfire codes to identify specific cylinders.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code, as low fuel can cause the engine to run lean, potentially damaging the catalytic converter or engine. Add fuel immediately and clear the code.
How much does it cost to fix?▼
If the issue is simply low fuel, the cost is just the price of gas. If components like the fuel pump or filter need replacement, expect $50-$150 for parts and labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.