Fuel and air

P02CE — Cylinder 2 Fuel Injector Offset Learning at Minimum Limit

Severity: medium Drive with care, to a shop

What P02CE means

The engine control module learns a small correction for each fuel injector so all cylinders deliver an even amount of fuel. P02CE sets when the learned offset for cylinder 2 reaches its minimum limit and the ECM cannot reduce fueling any further. This usually points to an injector delivering more fuel than commanded, or another problem skewing the mixture in that cylinder.

Symptoms

  • Check Engine light on
  • Rough or unstable idle
  • Misfire, especially on cylinder 2
  • Increased fuel consumption
  • Weak throttle response and acceleration
  • Fuel smell or smoke under load

Possible causes

  1. Leaking, sticking, or dirty cylinder 2 injector
  2. Poor connection or damaged wiring at the injector
  3. Fuel pressure too high or unstable (regulator, pump)
  4. ECM software or calibration error
  5. Intake air leak distorting the mixture
  6. Mechanical problem in cylinder 2, such as low compression

How to diagnose

  1. Scan all codes and freeze-frame data, looking for related injector, misfire, or fuel trim codes
  2. View injector learned offsets and fuel trims by cylinder on a scan tool
  3. Inspect the cylinder 2 injector connector and harness for corrosion, chafing, or a loose fit
  4. Test injector resistance and the control signal with a scope or noid light
  5. Measure fuel pressure and check that it holds after shutdown
  6. Run a cylinder balance or flow test, or swap injectors to see if the fault follows
  7. Check for intake or exhaust leaks and perform a compression test on cylinder 2

Common fixes

  • Clean or replace the cylinder 2 injector
  • Repair wiring or replace a damaged connector
  • Fix the fuel system fault: pressure regulator, pump, or filter
  • Update or reflash the ECM, then reset adaptations and run the learn procedure
  • Repair air leaks or the mechanical problem in the cylinder

Questions and answers

What does P02CE mean?

The ECM has pushed the cylinder 2 injector correction to its minimum limit. The injector is the most common cause, but wiring and fuel pressure should be checked too.

Can I drive with P02CE?

Briefly, for example to a shop. If the engine misfires badly or you smell fuel, stop driving to protect the catalytic converter.

Will clearing the code fix it?

No. The code will return once the ECM relearns the injector. Find and fix the cause first, then reset the adaptations.

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.