P0313
Misfire Detected with Low Fuel
Misfires are detected while the fuel level is low. The ECM disables further misfire reporting under this condition because intermittent fuel starvation can cause false positives in catalyst-damaging logic.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Symptoms
- Check engine light on or flashing
- Rough idle and uneven running
- Power loss, hesitation under acceleration
- Increased fuel consumption
- Possible smell of unburned fuel from exhaust
Common causes
Ordered by how often each turns out to be the cause.
- Fuel level very lowCommon
- Weak fuel pump or pickupPossible
- Faulty fuel level sensorLess likely
Parts involved
- Fuel Tank
- Fuel Level Sensor
- Fuel Pump
P0313 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.