Powertrain, generic (extended)

P2E5E Cylinder 6 Alternative Fuel Misfire Detected

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2E5E names cylinder 6 as the misfiring one while the engine runs on alternative fuel; P0306 is its petrol 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.

Likely causes

Gas or liquid-propane injector on cylinder 6 sticking or leaking
Propane vapour in the liquid-injection rail (hot restart, low rail or tank pressure)
Plug or coil on cylinder 6 failing under gas
Low tank pressure in cold weather or nearly empty tank

Symptoms

  • Misfire or rough running shortly after a hot restart
  • Long cranking time when the engine is warm
  • Check engine light

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,200
Time0.5–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

alt fuel injector cyl 6ignition coil cyl 6

Related codes

P2E58P0306P2E5DP2E5FP0206

References: law.cornell.edu, roushcleantech.com, image-ppubs.uspto.gov, image-ppubs.uspto.gov.