Powertrain, generic (extended)

P2E31 Battery Charger B Module Supply Voltage High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E31 is the high-side counterpart of P2E30: the low-voltage feed of charger B climbs above what its control electronics accept. On plug-in cars the DC/DC converter holds the 12 V network, so a converter regulating too high is the main suspect; a workshop charger or jump pack set too high, or a faulty measurement inside charger B, can give the same reading. No manufacturer documents P2E31 or a threshold publicly. Mitsubishi's Outlander PHEV pages put the upper edge of the charger test window at 16 V, for P0D67 as well as for the ROM check P0E5E, and Holley's 30-8405 charger unit is rated up to 16 V. Charger faults that get in the way of charging are covered by CARB. System overvoltage is P0563, the A-side twin P2E2E. Charger B likely stops to protect itself.

Likely causes

DC/DC converter regulating the 12 V network too high
Workshop charger or jump starter with excessive voltage
Faulty supply voltage measurement inside charger B

Symptoms

  • Charging via charger B stops or will not start
  • Overvoltage codes stored in several modules
  • 12 V battery gassing or lamps unusually bright

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,500
Time0.5–3 h

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

Parts involved

on board chargerdc dc converterwiring harness

Related codes

P2E2FP2E30P2E2EP0563

References: law.cornell.edu, mitsubishitechinfo.com, mitsubishitechinfo.com, documents.holley.com.