P2E5E code meaning
Cylinder 6 Alternative Fuel Misfire Detected
Powertrain system Generic code P2Exx codes Check engine light
What P2E5E means
P2E5E names cylinder 6 as the misfiring one while the engine runs on alternative fuel; P0306 is its gasoline twin. No manufacturer documents the code openly. On inline sixes cylinder 6 is the rearmost. With liquid propane injection, fuel turning to vapour in the rail is a known gas-specific cause: Roush CleanTech's diagnostic manual names running in the vapour region as a reason for P03xx misfire, a Ford patent notes that propane left in a hot rail boils off after shutdown and expands about 250-fold, and an Agility patent describes vapour forming when pressure sags along a rail feeding its injectors in series, so too little fuel is metered. Note whether misfire follows hot restarts or a low tank. A Texas training manual on propane conversions recommends the scan tool's cylinder balance test to confirm the cylinder.
P2E5E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2E5E
- Misfire or rough running shortly after a hot restart
- Long cranking time when the engine is warm
- Check engine light
Common causes of P2E5E
- Most likelyGas or liquid-propane injector on cylinder 6 sticking or leaking
- PossiblePropane vapour in the liquid-injection rail (hot restart, low rail or tank pressure)
- PossiblePlug or coil on cylinder 6 failing under gas
- Less likelyLow tank pressure in cold weather or nearly empty tank
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alt fuel injector cyl 6Ignition coil cyl 6
What each part of P2E5E means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5E | The exact fault in that area. |
What to do next
- Note P2E5E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2E5E
What does P2E5E mean?
P2E5E means "Cylinder 6 Alternative Fuel Misfire Detected". P2E5E names cylinder 6 as the misfiring one while the engine runs on alternative fuel; P0306 is its gasoline twin. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E5E?
Drive gently and only to a workshop. With P2E5E the car can go into limp mode (reduced power) to protect itself.
Will P2E5E fail an emissions test?
Yes, it can. P2E5E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2E5E to fix?
Difficulty: medium. A typical repair takes 0.5 to 5 hours of work. This is a job for a workshop.
Will P2E5E clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.