P2E61Alternative Fuel Misfire Detected With Low Fuel
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2E61 records misfire that occurs while the engine burns its gaseous fuel and that fuel is almost used up. No manufacturer documents the code publicly. CARB treats a bi-fuel car as alternate-fueled only while it runs on gas and lets makers seek approval to suspend misfire monitoring at 15 % fuel or less, since a nearly empty tank can cause misfire by itself. Ford patents explain it for CNG: the regulator keeps the rail at a few bar, but near 500 psi tank pressure the flow chokes and rail pressure wavers, so metering suffers; one known answer is switching to petrol at low tank pressure. Another Ford patent reads low rail pressure despite gas in the tank, e.g. from ice, as a supply restriction. Refill and recheck; misfire with ample gas is P2E58 to P2E60.
- What you may notice
- Stumbling or power loss on gas when the gas gauge is near empty
- Vehicle changes over to petrol on its own
- Check engine light on
- Likely causes
- LikelyGas tank close to empty, so the regulator can no longer hold rail pressure
- PossibleTank pressure or level signal reads too high, so the system stays on gas too long
- PossibleRestriction in the gas line (clogged filter, ice) that only shows when tank pressure is low
- RareWorn plugs or coils that cannot ignite the leaner gas mixture near empty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.