Powertrain, generic

P0E8B Battery Charger B Input Voltage Sensor Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0E8B covers an electrical fault in the voltage measurement at the input of charger B: the controller gets no valid reading of the supply voltage. Range, low and high faults of this sensor have their own codes, P2E84, P2E85 and P2E86; charger A uses P0D3D for its first input voltage sensor. Some code lists call it input voltage sensor A of charger B. No manufacturer documents P0E8B publicly. Ford checks the voltage side of charger B through P0E87 with a 450 V limit, which is a judgment of the value, whereas P0E8B means the value cannot be read at all. CARB expects such inputs to be monitored for circuit continuity and range. The sensing is usually built into the charger, so after ruling out connectors the charger is the likely part. Charging is blocked until the fault clears.

Likely causes

Voltage sensing circuit inside charger B defective
Loose or corroded connector, damaged sensing lead
Charger software fault

Symptoms

  • Plug-in charging is not possible
  • Charging fault message or charge-port indicator signals a fault

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time0.5–4 h

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

Parts involved

battery charger b input voltage sensorwiring harnesson board charger

Related codes

P2E84P2E85P2E86P0D3DP0E86P0E87

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