Powertrain, generic

P0E2F High Voltage Fuse B

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P0E2F says the battery management has found a second high-voltage fuse open, or believes it has. Several makers use it. Mercedes calls it electrical fuse B, the battery-internal fuse protecting auxiliary HV consumers in its plug-in hybrids: a shorted belt starter-alternator or another short in that line blows it, the engine no longer starts and only electric driving remains; once the short is fixed, the 2024 bulletin for series 206, 223, 254 and 290 has the HV battery replaced. On EQB models a DC/DC wake-up fault can set it without a blown fuse. Porsche lists it as fuse 2 on the 2020-22 Taycan, which is then not ready to drive. Volvo and Polestar compare the voltages after the front and rear fuse outputs with pack voltage. Main fuse: P0A95.

Likely causes

Short circuit in an HV consumer on the protected branch
False detection by the battery management or DC/DC wake-up fault
Faulty voltage measurement behind the fuse

Symptoms

  • Engine does not start, electric driving only (plug-in hybrids)
  • Vehicle not ready to drive or propulsion warning
  • MIL or HV drive system warning on

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–15,000
Time1–10 h

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

Parts involved

high voltage fusebattery energy control module

Related codes

P0A95P0E30P0E2E

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.