Powertrain, generic

P0E86 Battery Charger B Input Voltage Too Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0E86 means charger B sees less voltage at its input than it needs to work, although charging has been requested. It mirrors P0D27, which carries no letter and is used for the first charger. No manufacturer documents P0E86 publicly. Ford's plug-in hybrid summary (OBDSM1901) does list the opposite case on the same input, P0E87, which shows that the B input codes are in real use. A low input voltage is often caused outside the car: a weak or long house circuit, a faulty extension or charging cable, or a charging station that sags under load. Inside the car, worn inlet contacts or a bad high-voltage connection to the charger can do the same. CARB does not require faults originating in the supply to be detected, so an unconfirmed code may just reflect a poor socket.

Likely causes

Weak supply at the socket or charging station, long or undersized house wiring
Faulty charging cable, adapter or extension lead
Worn or burnt contacts in the charge inlet or its wiring to the charger
Voltage measurement inside charger B reads too low

Symptoms

  • AC charging does not start or stops shortly after starting
  • Charging works at another socket or station

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–2,000
Time0.3–4 h

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

Parts involved

battery charger bac input circuiton board charger

Related codes

P0E87P0D27P0E8BP0E88

References: law.cornell.edu, fordservicecontent.com.