Powertrain, generic (extended)

P2E5F Cylinder 7 Alternative Fuel Misfire Detected

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2E5F puts alternative-fuel misfire on cylinder 7, so it concerns eight-cylinder engines, for instance GM's Vortec 6.0 V8 in the bi-fuel Silverado/Sierra or the dedicated CNG and LPG Express/Savana vans that GM lists in its gaseous-fuel overview bulletin. P0307 is the petrol counterpart. No maker documents P2E5F publicly. On GM V8s cylinder 7 is the rear cylinder of the odd-numbered bank; on Ford V8s it is the third cylinder of the second bank. Conversion hardware adds failure points per cylinder: Ford's 2003 bi-fuel CNG system fed gas through sleeves set into each petrol injector seat, with a separate module driving the gas injectors, and Landi Renzo's 6.0-litre manual tells technicians to verify each nozzle in its port and the routing of the injector harness. Check these before the coil.

Likely causes

Gas injector on cylinder 7 faulty or sticking
Leaking injector sleeve or loose nozzle at cylinder 7's intake runner
Conversion injector harness damaged or misrouted near the rear of the engine
Coil or plug on cylinder 7 too weak for gas

Symptoms

  • Rough running on gas, smooth on petrol
  • Gas-mode indicator flashing or automatic return to petrol
  • Check engine light

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,000
Time0.5–5 h

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

Parts involved

alt fuel injector cyl 7ignition coil cyl 7

Related codes

P2E58P0307P2E5EP2E60P0357

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.