Powertrain, generic (extended)

P2E30 Battery Charger B Module Supply Voltage Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E30 is stored when the 12 V feed reaching the control board of charger B stays under its lower limit. Most causes lie upstream: a flat or aged 12 V battery, a blown fuse or failed relay in the charger feed, or corroded supply and ground contacts that lose voltage under load. No manufacturer documents P2E30 publicly, and no threshold is published. For a sense of scale, Holley's 30-8405 charger unit names 9–16 V as its normal range and keeps CAN alive only down to 6 V; Mitsubishi's Outlander PHEV lists a faulty charger supply circuit among the causes of lost communication with the charger (U019B). Under CARB rules a charger fault that blocks charging must be flagged. Too high is P2E31, charger A low is P2E2D. Charging via path B is likely refused; driving normally continues.

Likely causes

Discharged or aged 12 V battery
Blown fuse or failed relay in the charger B feed
Voltage drop across corroded supply or ground contacts
DC/DC converter not holding up the 12 V network

Symptoms

  • Charging through charger B does not start
  • Low-voltage or communication faults in other modules too
  • Reduced charging power if only one charger works

Repair estimate

DifficultyMediumDIY possible
Parts and labour€20–1,200
Time0.3–3 h

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

Parts involved

on board chargerwiring harness

Related codes

P2E2FP2E31P2E2DP0562P2E91

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