P2E59 code meaning
Cylinder 1 Alternative Fuel Misfire Detected
Powertrain system Generic code P2Exx codes Check engine light
What P2E59 means
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 gasoline 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 gasoline too: P0301.
P2E59 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P2E59
- Rough idle on gas that disappears in gasoline mode
- Stumble at the moment the system changes over to gas
- Check engine light, possibly flashing under load
Common causes of P2E59
- Most likelySticking or leaking gas injector on cylinder 1
- PossibleCracked injector hose or loose nozzle in the intake port of cylinder 1
- PossibleWeak coil or worn plug on cylinder 1 that fails only under gas
- Less likelyFault in the fuel changeover module or its programming (misfire only at the switch from gasoline to gas)
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 1Ignition coil cyl 1
What each part of P2E59 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 59 | The exact fault in that area. |
What to do next
- Note P2E59 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 P2E59
What does P2E59 mean?
P2E59 means "Cylinder 1 Alternative Fuel Misfire Detected". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E59?
Drive gently and only to a workshop. With P2E59 the car can go into limp mode (reduced power) to protect itself.
Will P2E59 fail an emissions test?
Yes, it can. P2E59 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 P2E59 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2E59 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.