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DTC codes / P2Exx · Hybrid propulsion / P2E60

P2E60Cylinder 8 Alternative Fuel Misfire Detected

P2E60 indicates that the powertrain control module has detected a misfire on cylinder 8 while the engine is running on an alternative fuel such as compressed natural gas, propane, or E85. The computer monitors crankshaft speed fluctuations and identifies that cylinder 8 is not contributing its fair share of power on the alternative fuel map.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaHybrid propulsion

Symptoms you may notice

  • Illuminated or flashing check engine light, especially under load
  • Rough idle or noticeable shaking when running on the alternative fuel
  • Loss of power or hesitation during acceleration on the alternative fuel
  • Often no symptoms besides the warning light if the misfire is intermittent
  • Poor fuel economy on the alternative fuel compared with normal operation
  • Possible smell of unburned fuel from the exhaust

Common causes, most likely first

  1. Worn or fouled spark plug specific to cylinder 8, often due to alternative fuel deposits
  2. Faulty ignition coil or plug wire on cylinder 8
  3. Leaking or clogged alternative fuel injector on cylinder 8
  4. Low compression on cylinder 8 from worn rings, valves, or head gasket
  5. Vacuum leak affecting the intake runner for cylinder 8
  6. Contaminated alternative fuel or incorrect fuel pressure for the alternative fuel system
  7. Wiring or connector fault at the cylinder 8 injector or coil

How to diagnose and fix it

  1. Scan all stored and pending codes and record freeze-frame data to confirm the misfire occurs only on the alternative fuel map
  2. Inspect the spark plug and ignition coil on cylinder 8 for wear, fouling, or carbon tracking and swap them with a known-good cylinder to see if the misfire moves
  3. Perform a cylinder contribution test or misfire counter check with a scan tool to verify cylinder 8 is the only affected cylinder
  4. Check the alternative fuel injector on cylinder 8 for clogging, leaks, or electrical resistance compared with other cylinders
  5. Run a compression test and, if low, a cylinder leak-down test on cylinder 8 to rule out mechanical faults
  6. Smoke-test the intake system for vacuum leaks near cylinder 8 and inspect the alternative fuel pressure and quality
  7. Repair or replace the confirmed faulty component and clear the codes, then road-test on the alternative fuel to verify the misfire is gone

Why alternative fuel misfires fool technicians

  • Alternative fuels such as compressed natural gas and propane burn hotter and drier than gasoline, which accelerates spark plug wear and can cause a cylinder 8 misfire long before the recommended plug interval.
  • A P2E60 can be set by a marginal ignition coil that only breaks down under the higher cylinder pressure seen on the alternative fuel map, so a coil that tests fine on gasoline may still be the culprit.
  • Technicians often replace the spark plug and coil on cylinder 8 without checking alternative fuel injector balance, and a partially clogged injector will set the code again within a few drive cycles.
  • The code does not always mean the engine has a mechanical failure; a loose or corroded connector at the cylinder 8 injector can mimic a failed injector and is frequently overlooked.
  • Because cylinder 8 is at the rear of many V8 engines, access is difficult and visual inspection is often skipped, so a simple chafed wire harness near the firewall can be the real cause.

Can I keep driving with P2E60?

You can drive the vehicle gently to a repair shop, but avoid heavy acceleration or towing because a persistent misfire on cylinder 8 can overheat the catalytic converter and cause expensive damage. If the check engine light is flashing, stop driving and have the vehicle towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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