Fuel and air

P02F8 — Cylinder 11 Injector Circuit Range/Performance

Severity: medium Drive with care, to a shop

What P02F8 means

P02F8 means the engine control module detected that the cylinder 11 injector circuit is operating outside its expected range, either electrically or in how the injector responds to commands. The ECM normally supplies power and switches the injector's ground at the right moment, while monitoring the circuit. This code appears on engines with at least 11 cylinders, such as V12 designs.

Symptoms

  • Check Engine light on
  • Rough idle
  • Misfires or stumbling
  • Reduced power or hesitation on acceleration
  • Increased fuel consumption
  • Raw fuel smell from the exhaust

Possible causes

  1. Faulty cylinder 11 injector (electrical or mechanical)
  2. Damaged injector wiring harness (open, short, chafing)
  3. Corroded or loose injector connector
  4. Poor power or ground supply to the injector circuit
  5. Failed injector driver inside the ECM
  6. Fuel supply problem such as low pressure
  7. Air leak skewing the air-fuel mixture

How to diagnose

  1. Scan all codes and freeze frame data; look for other injector or misfire codes
  2. Inspect the cylinder 11 injector connector and harness for chafing, corrosion or heat damage
  3. Check supply voltage and the control signal at the injector connector
  4. Measure injector coil resistance and compare to spec and to neighboring injectors
  5. Review fuel trims and cylinder balance data on a scan tool
  6. Test fuel pressure
  7. Look for intake air leaks and exhaust leaks
  8. Swap the injector with another cylinder and see whether the fault follows it

Common fixes

  • Replace the faulty injector
  • Repair or replace damaged wiring and connectors
  • Correct the power or ground supply fault
  • Repair or replace the ECM if the driver fault is confirmed
  • Fix air leaks and reset fuel adaptations

Questions and answers

What does P02F8 mean?

It is a range/performance fault in the cylinder 11 injector circuit. The ECM sees electrical values or injector behavior outside the normal window.

Can I drive with P02F8?

Only briefly and carefully, until it is diagnosed. Misfires and a wrong air-fuel mixture can damage the catalytic converter and the engine.

Do I always need a new injector?

No. Wiring, connectors or power supply problems are common causes. Test the circuit and injector resistance before replacing the part.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.