P2E5D code meaning
Cylinder 5 Alternative Fuel Misfire Detected
Powertrain system Generic code P2Exx codes Check engine light
What P2E5D means
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 gasoline 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.
P2E5D 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 P2E5D
- Vibration and power loss on gas
- Bi-fuel vehicle drops back to gasoline
- Check engine light
Common causes of P2E5D
- Most likelySpark plug on cylinder 5 past its change interval or damaged when handled
- PossibleLow-pressure oil separator/filter not serviced, oil reaches the gas injector of cylinder 5
- PossibleGas injector on cylinder 5 faulty
- Less likelyCracked coil extension or trunk on cylinder 5 (heavy-duty gas engines)
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 5Ignition coil cyl 5
What each part of P2E5D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 5D | The exact fault in that area. |
What to do next
- Note P2E5D 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 P2E5D
What does P2E5D mean?
P2E5D means "Cylinder 5 Alternative Fuel Misfire Detected". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2E5D?
Drive gently and only to a workshop. With P2E5D the car can go into limp mode (reduced power) to protect itself.
Will P2E5D fail an emissions test?
Yes, it can. P2E5D 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 P2E5D to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2E5D 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.