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DTC codes / P02xx · Fuel and air metering (injector circuits) / P02FE

P02FECold Start Fuel Injection Control Circuit Range/Performance

P02FE indicates that the engine control module has detected an out-of-range condition in the cold start fuel injection control circuit, which is responsible for delivering extra fuel when the engine is first started from a cold soak. The computer compares expected cold-start fuel delivery against actual circuit feedback and sets this code when the signal falls outside the calibrated range for a specified time.

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 stumbling immediately after a cold start
  • Extended cranking time before the engine fires when cold
  • Hesitation or flat spot during the first few minutes of driving
  • Slightly elevated or erratic idle speed while the engine warms up
  • Occasional lean misfire codes or a pending misfire during warm-up

Common causes, most likely first

  1. Faulty cold start fuel injector or its electrical connector
  2. Damaged or corroded wiring in the cold start injector circuit
  3. Failed cold start injector timer switch or thermo-time switch
  4. Engine control module software calibration issue or internal driver fault
  5. Poor ground connection shared with the cold start circuit
  6. Contaminated or clogged cold start injector nozzle
  7. Low fuel pressure or restricted fuel delivery during cold cranking

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data to confirm when the code sets and whether other codes are present
  2. Inspect the cold start injector connector and harness for corrosion, chafing, or loose pins
  3. Measure resistance of the cold start injector and compare to the manufacturer's specification
  4. Test the cold start injector timer switch or thermo-time switch for correct continuity at cold and warm temperatures
  5. Check fuel pressure and delivery volume during cold cranking with a gauge
  6. Verify the control circuit ground and power feed with a loaded test light or oscilloscope
  7. If all electrical and fuel checks pass, reflash or replace the engine control module only after confirming the driver circuit is faulty

Cold start circuit checks most technicians skip

  • Many vehicles set P02FE because the cold start injector timer switch is stuck closed, flooding the engine briefly on cold start rather than because the injector itself has failed.
  • A weak battery or slow cranking speed can cause the engine control module to log this code even when the cold start circuit is electrically sound, because the module expects a minimum cranking RPM before enabling cold start enrichment.
  • Technicians often replace the cold start injector without checking the shared ground point on the intake manifold or cylinder head, which is a common corrosion point that skews the circuit feedback.
  • This code does not always mean the cold start injector is bad; a restricted fuel filter or failing fuel pump check valve can cause the same out-of-range condition during the cold start window.
  • On some engines, a vacuum leak that leans out the mixture only when cold can trigger P02FE because the control module sees the cold start fuel trim outside its expected range.

Can I keep driving with P02FE?

You can usually drive the vehicle, but expect rough running and possible stalling during the first few minutes after a cold start. Avoid heavy acceleration and long warm-up idling until the fault is repaired, and address it promptly to prevent misfire damage to the catalytic converter.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage