Powertrain, generic

P0E6C Battery Charging System Precharge Contactor Circuit Stuck Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0E6C reports that the precharge contactor of the charging system does not close, or that no current flows through the precharge branch, even though the command was given. The charger side then cannot be brought up to pack voltage, the main charging contactors stay open and the session ends before any energy flows. No manufacturer documents P0E6C publicly. GM's 2019 hybrid tables show the measurable symptom under other codes: if the charger bus is still outside 95 to 105 percent of pack voltage after 0.7 seconds, P0D26 is set, and if charger voltage stays under 10 V once a precharge attempt has failed, GM blames the positive charging contactor with P0D09, both Type A. CARB counts such charging failures among the faults a plug-in hybrid must detect. A welded contactor is P0E6B instead.

Likely causes

Open precharge resistor interrupting the branch
Burnt or contaminated contactor contacts not conducting
Contactor coil not pulling in due to low supply

Symptoms

  • Charging stops a few seconds after plugging in
  • Repeated clicking from the battery area at charge start

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–2,500
Time1.5–6 h

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

Parts involved

precharge contactorprecharge resistorbms

Related codes

P0E6AP0E6BP0D26P0D09P0AE3

References: gsi.ext.gm.com, law.cornell.edu.