Fuel and air

P02D7 — Cylinder 6 Fuel Injector Offset Learning at Maximum Limit

Severity: medium Drive with care, to a shop

What P02D7 means

The engine control module continuously trims how long each injector stays open so the fuel delivered matches what it calculated. For cylinder 6, that learned correction (offset) has hit its upper limit, so the module cannot compensate any further. This usually points to an injector that is delivering inaccurately or to a fuel or air problem affecting that cylinder.

Symptoms

  • Check Engine light on
  • Rough idle
  • Misfire on cylinder 6
  • Worse fuel economy
  • Hesitation or weak throttle response
  • Visible exhaust smoke under load

Possible causes

  1. Clogged, sticking or worn cylinder 6 fuel injector
  2. Poor connection or damaged wiring at the injector
  3. Low fuel pressure, clogged fuel filter or restricted fuel rail
  4. Intake air leak near cylinder 6
  5. ECM software or calibration issue (uncommon)

How to diagnose

  1. Scan for codes and freeze-frame data, and note any misfire or fuel trim codes
  2. Review fuel trim and injector adaptation values by cylinder in live data
  3. Inspect the cylinder 6 injector connector and harness for corrosion, chafing and a loose fit
  4. Measure injector resistance and check power and control signal from the ECM
  5. Test fuel pressure and check the condition of the fuel filter
  6. Look for intake manifold and vacuum hose leaks
  7. Run an injector balance test, or swap injectors to see if the problem follows
  8. Check for ECM software updates for the vehicle

Common fixes

  • Replace, or have a shop clean and flow-test, the cylinder 6 injector
  • Repair the injector wiring or connector
  • Replace the fuel filter and correct the cause of low fuel pressure
  • Fix any intake air leak
  • Update or reflash the ECM, then reset learned values

Questions and answers

What does P02D7 mean?

The ECM has used up its adjustment range for the cylinder 6 injector and cannot trim fuel delivery any further. The injector itself is the most common cause, but wiring, fuel pressure and air leaks should be checked too.

Can I drive with code P02D7?

Briefly, if the engine runs smoothly. If it misfires or the check engine light flashes, stop driving to avoid damaging the catalytic converter.

Will clearing the code fix it?

No. The code will come back until the underlying cause is fixed. Start by checking the injector, its electrical circuit, fuel pressure and intake sealing.

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.