Powertrain, generic (extended)

P2E59 Cylinder 1 Alternative Fuel Misfire Detected

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

P2E59 means that, while the engine is burning its gaseous fuel, the misfire monitor puts the dropouts on cylinder 1; CARB allows a single-cylinder code once more than 90 % of counted misfires fall on one cylinder. In most numbering schemes cylinder 1 is the frontmost. No manufacturer publishes P2E59. Honda logged misfire on its 2008 Civic CNG as P0301 to P0304 and had dealers swap coils to see whether the fault moved with the coil. On GM's 2013 Silverado/Sierra bi-fuel the injector module hands over from petrol to CNG injectors one cylinder after another, starting at cylinder 1, so a misfire seen only at changeover should be told apart from one in steady gas mode. Check the CNG injector, its hose and nozzle on cylinder 1, then coil and plug. Misfire on petrol too: P0301.

Likely causes

Sticking or leaking gas injector on cylinder 1

Cracked injector hose or loose nozzle in the intake port of cylinder 1

Weak coil or worn plug on cylinder 1 that fails only under gas

Fault in the fuel changeover module or its programming (misfire only at the switch from petrol to gas)

Symptoms

Rough idle on gas that disappears in petrol mode
Stumble at the moment the system changes over to gas
Check engine light, possibly flashing under load

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€80–900

Time0.5–4 h

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

Parts involved

alt fuel injector cyl 1ignition coil cyl 1

Related codes

P2E58 P0301 P2E5A P0201 P0351

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov, en.wikipedia.org.