Powertrain, generic

P0EFC Battery Charger A Input Voltage Sensor C Circuit Range/Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

With P0EFC, sensor C of charger A delivers an electrically sound signal whose value conflicts with the charger's other readings. No manufacturer documents P0EFC publicly. For sensor A, GM shows such a cross-check on the 2011 Volt: the charger module compares the AC peak voltage with two independent bulk voltage readings, and if both differ by more than 34 V for 512 ms within 640 ms, P0D3E is stored as Type A. GM preliminary information PIC5803 (Volt 2011 to 2013, Spark EV 2014) adds a warning: P0D3E together with P1E00 after an interrupted charge usually came from a brown-out, a power cut or a faulty cord set, not from the car. CARB likewise does not demand detection of faults that look the same as a weak supply. Check the outlet and station before blaming the charger.

Likely causes

Voltage dips, brown-out or power cut at the outlet or station during charging (GM PIC5803 for the sensor A code)
Faulty or poorly calibrated charging cord set or wallbox
Gain or offset drift of measuring channel C in the charger
Charger software needing an update

Symptoms

  • Charging stops part-way or does not reach full charge
  • Fault appears only at certain outlets or stations
  • Charging fault message, sometimes with a warning lamp

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€0–2,500
Time0.3–4 h

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

Parts involved

battery charger a input voltage sensor con board charger

Related codes

P0EFBP0EFDP0EFEP0EF8P0D3E

References: gsi.ext.gm.com, static.nhtsa.gov, law.cornell.edu.