Powertrain, generic (extended)

P2E84 Battery Charger B Input Voltage Sensor Circuit Range/Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E84 questions the plausibility of the grid voltage that charger B reads at its input: the sensor answers within its electrical limits, yet the figure does not suit the moment, such as a voltage with no supply connected or a value that contradicts other readings. No manufacturer documents P2E84 publicly. How such a check works is shown on charger A: GM's 2011 Volt compares the AC peak voltage with two internal bulk voltages and fails when both differ by more than 34 V (Type A), while Mitsubishi's Outlander PHEV reacts to 25 V or more held for 2 s. On the Polestar 3, whose AC charger reports as charger B, input sensor faults appear as P0E8B16 and lead to replacement of the unit if DC charging still works. Hard low or high readings are P2E85/P2E86. AC charging is usually refused.

Likely causes

Voltage sensing inside charger B drifting or faulty
Corroded or loose AC contacts between charge inlet and charger B
Unstable or unusual supply from the charging station or house circuit
Charger software misjudging the reading

Symptoms

  • AC charging does not start or stops after a short time
  • DC fast charging still works normally
  • Charging fault message in the instrument cluster or app

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–3,000
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

P0E8BP2E85P2E86P0D3EP0E86P0E87

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