Powertrain, generic (extended)

P2E5D Cylinder 5 Alternative Fuel Misfire Detected

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2E5D assigns gas-mode misfire to cylinder 5, which exists only on engines with five or more cylinders, such as the 3.6-litre V6 in GM's 2015 Impala bi-fuel, V8 trucks or inline-six gas engines in buses. P0305 is the petrol equivalent. No manufacturer publishes P2E5D. With bank-wise numbering (Ford, Audi) cylinder 5 opens the second bank; with crank-order numbering (GM, Chrysler) it lies on the odd-numbered bank. In the Impala, GM placed an oil separator with filter in the low-pressure line before the CNG rail and set a 36,000-mile change interval; an overdue element lets oil reach the injectors. For its heavy natural-gas engines, Cummins names worn, damaged or mishandled spark plugs as a leading cause of unplanned misfire downtime. CARB §1971.1 covers such heavy-duty gas engines.

Likely causes

Spark plug on cylinder 5 past its change interval or damaged when handled
Low-pressure oil separator/filter not serviced, oil reaches the gas injector of cylinder 5
Gas injector on cylinder 5 faulty
Cracked coil extension or boot on cylinder 5 (heavy-duty gas engines)

Symptoms

  • Vibration and power loss on gas
  • Bi-fuel vehicle drops back to petrol
  • Check engine light

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,000
Time0.5–4 h

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

Parts involved

alt fuel injector cyl 5ignition coil cyl 5

Related codes

P2E58P0305P2E5CP2E5EP0355

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