Powertrain, generic

P0E70 Battery Charging System Precharge Contactor Control Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0E70 is the high-side counterpart of P0E6F: the coil line of the charging precharge contactor carries voltage although the driver is off. A short to a 12 V feed can energise the coil without a command, which would let the precharge branch conduct unasked; the battery management therefore usually locks out charging. No manufacturer documents P0E70 publicly. For its positive charging contactor GM tests exactly this case in the 2019 hybrid tables (P0D0A): with the driver off, an output voltage above the 12 V battery voltage minus 0.4 V counts as a short to power, confirmed by 40 of 50 samples at 12.5 ms, Type B. Mitsubishi's i-MiEV sets P0AE7 when the coil monitor stays on after an off command. An open coil circuit is P0E6D.

Likely causes

Coil control wire shorted to a 12 V supply
Driver stage in the battery management unit stuck on
Open ground return of the coil leaving the line at supply level

Symptoms

  • Charging locked out with a high-voltage fault message
  • Contactor clicks without a charging request

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–1,500
Time1–4 h

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

Parts involved

precharge contactorwiring harnessbms

Related codes

P0E6DP0E6EP0E6FP0AE7P0D0A

References: gsi.ext.gm.com, static.nhtsa.gov.