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DTC codes / P02xx · Fuel and air metering (injector circuits) / P02F8

P02F8Cylinder 11 Injector Circuit Range/Performance

P02F8 indicates that the powertrain control module (PCM) has detected an abnormal condition in the electrical circuit for cylinder 11's fuel injector, specifically a range or performance fault rather than a simple open or short. The PCM monitors injector current and response time, and this code sets when the circuit's behavior falls outside the expected parameters for proper fuel delivery.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Illuminated check engine light, often with no other noticeable symptoms
  • Rough idle or misfire sensation, especially noticeable at idle or low speeds
  • Engine hesitation or stumble during acceleration
  • Reduced fuel economy due to improper fuel delivery
  • Possible vibration or shaking felt through the steering wheel or seat
  • In some cases, the engine may enter limp mode or exhibit reduced power

Common causes, most likely first

  1. Faulty fuel injector for cylinder 11 (internal coil or mechanical issue)
  2. Damaged or corroded wiring harness or connector at the injector
  3. Poor electrical connection at the PCM or injector pigtail
  4. Failed injector driver inside the PCM (less common)
  5. Contamination or clogging in the injector affecting its performance
  6. Aftermarket or incorrect injector installed previously

How to diagnose and fix it

  1. Perform a visual inspection of the cylinder 11 injector connector and wiring for damage or corrosion
  2. Use a noid light to verify that the injector is receiving a pulsing ground signal from the PCM
  3. Measure the injector coil resistance with a multimeter and compare to specifications
  4. Check for continuity and shorts in the wiring between the injector and PCM
  5. Swap the cylinder 11 injector with a known-good injector from another cylinder to see if the code follows
  6. If the injector tests bad, replace it with a quality OEM or equivalent unit
  7. If wiring and injector are good, diagnose the PCM driver circuit or reprogram/replace the PCM as needed

Cylinder 11 injector circuit quirks

  • Cylinder 11 is often on a high-count engine (e.g., V12 or heavy-duty diesel), so confirm the firing order and injector location before testing.
  • A range/performance code can be set by a mechanically sticking injector that still passes a resistance test, so flow testing may be necessary.
  • Corrosion inside the injector connector pins is a frequent cause that is easily overlooked during visual inspection.
  • The PCM may set this code intermittently if the injector coil is failing only when hot, so testing when the engine is at operating temperature is crucial.
  • Always check for technical service bulletins (TSBs) for the specific vehicle, as some applications have known harness routing issues.

Can I keep driving with P02F8?

Driving with P02F8 is generally safe for short distances, but avoid heavy acceleration or towing until diagnosed, as a misfiring cylinder can damage the catalytic converter over time. If the engine runs very rough or flashes the check engine light, stop driving and seek service immediately.

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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