P0EFC code meaning
Battery Charger A Input Voltage Sensor C Circuit Range/Performance
What P0EFC means
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.
P0EFC at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.3 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0EFC
- 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
Common causes of P0EFC
- Most likelyVoltage dips, brown-out or power cut at the outlet or station during charging (GM PIC5803 for the sensor A code)
- PossibleFaulty or poorly calibrated charging cord set or wallbox
- PossibleGain or offset drift of measuring channel C in the charger
- Less likelyCharger software needing an update
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Battery charger a input voltage sensor cOn board charger
What each part of P0EFC means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| FC | The exact fault in that area. |
What to do next
- Note P0EFC and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0EFC
What does P0EFC mean?
P0EFC means "Battery Charger A Input Voltage Sensor C Circuit Range/Performance". With P0EFC, sensor C of charger A delivers an electrically sound signal whose value conflicts with the charger's other readings. It is a generic code, so it means the same on every make.
Is it safe to drive with P0EFC?
P0EFC does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0EFC fail an emissions test?
P0EFC is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0EFC to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 4 hours of work. This is a job for a workshop.
Will P0EFC clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.