Powertrain, generic

P0E6B Battery Charging System Precharge Contactor Circuit Stuck Closed

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P0E6B means the precharge contactor of the charging system appears to stay closed although it has been told to open, usually because its contacts have welded. The battery management notices this when the charger side carries voltage before any precharge was requested, or when it does not drop after switch-off. That is a safety matter: the charging path may remain live. No manufacturer documents P0E6B publicly. Mitsubishi's i-MiEV manual, published as a 2019 bulletin, handles the comparable weld of its charging contactor under P0AE2 and checks it as the high-voltage system is activated; besides wiring and the contactor itself it lists the combined charger and DC-DC unit and other high-voltage loads as possible causes. CARB requires faults that disable charging to be detected. The opposite fault is P0E6C.

Likely causes

Precharge contactor contacts welded together
Coil kept energised by a control line fault
Residual voltage from another high-voltage unit misread as a closed contactor

Symptoms

  • Charging blocked and high-voltage warning displayed
  • Vehicle may refuse to switch to ready mode

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€300–2,500
Time1.5–6 h

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

Parts involved

precharge contactorprecharge resistorbms

Related codes

P0E6AP0E6CP0AE2

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