Powertrain, generic (extended)

P2E40 Battery Charger B Module Forced Shutdown Voltage High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2E40 means the forced shutdown signal of charger B reads above its valid band, typically from a short to a 12 V wire or a leak inside the charger or the module that drives it. No manufacturer documents P2E40 publicly. With fail-safe logic, as Watt & Well specifies for the EVCC, where flowing current stands for normal operation, a line held high can no longer pass on a stop order, so the hardware path that should end charging in an emergency is lost. For that reason a control unit would rather keep charger B disabled than run it without a working off-switch. CARB's onboard charger requirement covers this too. Low is P2E3F, implausible P2E3E, charger A high P2E34. The driver mainly notices slower or no charging.

Likely causes

Shutdown line of charger B shorted to a 12 V wire
Internal leakage in charger B or the commanding module
Miswiring after a harness or charger repair

Symptoms

  • Charging slower or impossible with charger B locked out
  • Charging system warning message

Repair estimate

DifficultyHardWorkshop job
Parts and labour€60–2,000
Time0.5–4 h

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

Parts involved

on board chargerwiring harness

Related codes

P2E3EP2E3FP2E34P2E31

References: law.cornell.edu, wattandwell.com.