Powertrain, generic

P0E85 Battery Charger B Temperature Too High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0E85 reports that the second charger stage or second on-board charger, labelled B, has become hotter than its own protection limit allows. Like the A counterpart P0D24, it is a heat verdict, not a sensor fault: the charger trusts its reading and cuts back power or stops to save its semiconductors. No manufacturer documents P0E85 with set conditions in public sources. Toyota shows that the letter B is real hardware: the 6.6 kW charger of the RAV4 Prime logs its input current fault as charger B (P0E89). CARB asks plug-in hybrids to flag charger failures that stop charging or reduce its rate. Typical triggers are poor coolant flow or air flow, a clogged heat exchanger or an internal defect. Expect slow or aborted AC charging, not loss of drive.

Likely causes

Too little coolant or air flow through charger B (low coolant, pump, blocked fins)
Internal defect in the power stage of charger B
Long full-power charging in very hot surroundings

Symptoms

  • AC charging slows down noticeably or stops before the battery is full
  • Charging fault message or flashing charge-port indicator

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–3,000
Time0.5–5 h

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

Parts involved

battery charger bbattery charger b coolingon board charger

Related codes

P0D24P2DB6P0E86P0E89

References: law.cornell.edu, static.nhtsa.gov.