Powertrain, generic (extended)

P2DE1 Cold Start Fuel Injection Quantity C Higher Than Expected

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2DE1 is the only code of this family with public manufacturer use. Honda names it Cold Start Air Fuel Ratio Control System Rich: during the cold-start emission strategy the PCM checks whether the mixture measured by the LAF (wide-band) sensor is richer than commanded. Bulletin 22-009 for the 2021 Accord Hybrid says the LAF sensor may misjudge the mixture as rich under certain fuel and shutdown conditions; bulletin 23-100 for the 2021-22 HR-V blames a PCM miscalculation. Both cure it with new PGM-FI software and light the MIL. Version 2 of 23-100 also has the oil level checked after a warm-up and the oil changed if above the upper mark. Real causes besides software are leaking injectors and faulty air or coolant temperature signals.

Likely causes

PCM software (Honda bulletins 22-009, 23-100)
Injector leaking, extra fuel during cold start
Coolant temperature or airflow signal wrong
Air-fuel ratio (LAF) sensor faulty

Symptoms

  • Check engine light on after a cold start
  • Usually no noticeable driving problem
  • Oil level above the upper mark possible

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,500
Time0.3–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injector group coxygen sensorecm

Related codes

P2DE0P2DDDP2DD8P2DE3P027F

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.