Worn or fouled spark plugs specific to alternative fuel use, which often require a different heat range and gap; Degraded ignition coils or spark plug wires causing weak spark under lean alternative fuel mixtures; Clogged or malfunctioning alternative fuel injectors due to fuel composition or contamination; Incorrect fuel pressure or volume from the alternative fuel pump or pressure regulator; Vacuum leaks or intake manifold gasket leaks that lean out the mixture and cause misfires; Faulty oxygen sensor or mass airflow sensor providing incorrect fuel trim data; Mechanical issues such as low compression, worn valve seats, or carbon buildup on valves

DTC codes / P2Exx · Hybrid propulsion / P2E58

P2E58Alternative Fuel Random/Multiple Cylinder Misfire Detected

Q: What does code P2E58 mean?

Alternative Fuel Random/Multiple Cylinder Misfire Detected. P2E58 indicates that the powertrain control module has detected random or multiple misfires on an engine running on an alternative fuel such as compressed natural gas, liquefied petroleum gas, or E85. The computer monitors crankshaft speed fluctuations and identifies that misfires are occurring across more than one cylinder without a consistent pattern, which can damage the catalytic converter and increase emissions.

P2E58 indicates that the powertrain control module has detected random or multiple misfires on an engine running on an alternative fuel such as compressed natural gas, liquefied petroleum gas, or E85. The computer monitors crankshaft speed fluctuations and identifies that misfires are occurring across more than one cylinder without a consistent pattern, which can damage the catalytic converter and increase emissions.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

Illuminated or flashing check engine light, especially under load
Rough idle or engine shaking felt through the steering wheel and seat
Noticeable loss of power or hesitation during acceleration
Poor fuel economy or increased alternative fuel consumption
Often no symptoms besides the warning light in early stages
Engine may stall or run poorly when cold or under heavy load

Common causes, most likely first

Worn or fouled spark plugs specific to alternative fuel use, which often require a different heat range and gap
Degraded ignition coils or spark plug wires causing weak spark under lean alternative fuel mixtures
Clogged or malfunctioning alternative fuel injectors due to fuel composition or contamination
Incorrect fuel pressure or volume from the alternative fuel pump or pressure regulator
Vacuum leaks or intake manifold gasket leaks that lean out the mixture and cause misfires
Faulty oxygen sensor or mass airflow sensor providing incorrect fuel trim data
Mechanical issues such as low compression, worn valve seats, or carbon buildup on valves

How to diagnose and fix it

Scan all stored and pending codes, freeze frame data, and misfire counters per cylinder to confirm random versus single-cylinder misfire
Inspect spark plugs for wear, gap, and fouling, and replace them with the correct alternative-fuel-specific plugs if needed
Test ignition coils and wires with a spark tester or oscilloscope, and replace any that show weak or inconsistent spark
Check fuel pressure and volume at the alternative fuel rail, and inspect injectors for clogging or incorrect spray pattern
Perform a smoke test to detect vacuum leaks and inspect intake manifold gaskets and hoses
Verify oxygen sensor and mass airflow sensor operation with live data, looking for skewed fuel trims or lazy response
If all else is normal, perform a compression test and cylinder leak-down test to rule out mechanical faults

Alternative fuel misfires need different diagnostic logic

Alternative fuels like E85 and CNG burn cooler and can foul standard spark plugs faster, so using the wrong plug heat range is a common cause of random misfires that generic scanners miss.
A flashing check engine light with P2E58 means active misfires that can overheat the catalytic converter within minutes, so diagnosis should not be delayed even if the engine feels normal.
Random misfires on alternative fuel engines are often misdiagnosed as ignition coil failures when the real culprit is a lean fuel mixture from a vacuum leak or a failing fuel pressure regulator.
The code can be set by a weak alternative fuel pump that delivers correct pressure at idle but drops under load, so fuel pressure must be tested under driving conditions, not just at idle.
Carbon buildup on intake valves is more pronounced on some alternative fuel engines and can cause random misfires that disappear after a professional intake cleaning.

Can I keep driving with P2E58?

Do not continue driving with a flashing check engine light or noticeable misfire, as unburned fuel can quickly destroy the catalytic converter and cause costly damage. If the light is steady and the engine runs smoothly, limit driving to a short distance to a repair shop and avoid heavy acceleration or towing.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.