Fuel and air

P02F7 — Cylinder 10 Injector Circuit Range/Performance

Severity: medium Drive with care, to a shop

What P02F7 means

The engine control unit drives each fuel injector with timed pulses and monitors the current and voltage in the circuit. P02F7 means the cylinder 10 injector circuit is performing outside the expected range, even if there is no clear open or short. It appears on engines with ten or more cylinders, such as V10 and V12 designs.

Symptoms

  • Check Engine Light on
  • Rough idle or misfire
  • Reduced engine power
  • Worse fuel economy
  • Hesitation or stumbling under load
  • Fuel smell from the exhaust

Possible causes

  1. Faulty cylinder 10 fuel injector (electrical or mechanical)
  2. Damaged wiring harness or poor connection at the injector connector
  3. Corroded or contaminated connector terminals
  4. Power supply problem such as a fuse or relay
  5. Faulty injector driver inside the PCM
  6. Mixture deviation from an air leak or low fuel pressure

How to diagnose

  1. Scan for codes and freeze frame data, and look for other injector or misfire codes
  2. Review fuel trims and cylinder balance to see whether the cylinder runs lean or rich
  3. Inspect the cylinder 10 injector connector and harness for damage, corrosion or chafing
  4. Check the fuses and relays that power the injectors
  5. Measure injector coil resistance and compare it with the factory specification
  6. Check supply voltage and the control signal at the connector with a scope or noid light
  7. Swap the injector with a neighboring cylinder and see if the fault follows it
  8. Check fuel pressure and inspect for intake air leaks

Common fixes

  • Replace the cylinder 10 fuel injector
  • Repair or replace the damaged wiring and connector
  • Replace a failed fuse or relay
  • Clean the connector terminals and remove corrosion
  • Repair, replace or reprogram the PCM (last resort)

Questions and answers

What does P02F7 mean?

It is a generic OBD-II code saying the cylinder 10 injector circuit is working outside its normal range. The cause can be the injector, wiring, power supply or, rarely, the PCM.

Can I drive with P02F7?

Only briefly and carefully until it is repaired. If the engine is misfiring, avoid driving, since it can damage the catalytic converter.

Do I always need a new injector?

No. Check the connector, wiring, fuses and relays first. Replace the injector only when testing shows it is faulty.

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.