P2E58Alternative Fuel Random/Multiple Cylinder Misfire Detected
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2E58 is the collective misfire code for running on the second fuel, mostly CNG or LPG: misfires are counted while gas is burned, but no single cylinder can be blamed, or several each carry a large share. CARB treats a bi-fuel car as alternate-fueled only while it runs on gas and asks for the same misfire monitor as on petrol; EPA likewise requires converters to keep OBD working on the conversion fuel. No carmaker documents P2E58 openly; Honda's Civic CNG and Roush propane trucks log gas-mode misfire with the ordinary P03xx codes. A GM patent checks both fuels: misfire on gas only points to the gas side, on both fuels to ignition. Likely culprits are an iced or poorly heated regulator or vaporiser, a clogged filter, low gas pressure or a lean mixture. One-cylinder faults are P2E59 to P2E60.
- What you may notice
- Rough running or jerking only while the engine runs on gas
- Bi-fuel vehicle switches back to petrol on its own
- Check engine light on or flashing, gas-mode indicator may flash
- Likely causes
- LikelyGas pressure regulator or LPG vaporiser iced up or not heated enough (low coolant flow, moisture in the gas)
- PossibleToo little gas pressure at the rail – clogged gas filter, nearly empty tank or weak regulator
- PossibleWorn plugs or weak coils on several cylinders that cope with petrol but not with the harder-to-ignite gas mixture
- PossibleLean gas mixture from an intake air leak or wrong gas-system calibration
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.