Powertrain, generic · Hybrid propulsion

P0AE7 Hybrid/EV Battery Precharge Contactor A Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0AE7 is stored when the control line of precharge contactor A carries too much voltage for its commanded state, typically a short to the 12 V supply. In GM's 2016 and 2019 hybrid tables the high-side driver output reads between 5.27 and 19.7 V while the contactor is commanded off, 40 of 50 samples at 12.5 ms, Type B, two trips. GM's 2013 eAssist controller looks for a short to power on its low-side driver in the on state, 3 of 5 samples at 50 ms, Type B. A coil energized by a short may keep the precharge path closed when it should be open, so P0AE2 can follow. CARB requires circuit monitoring of such hybrid outputs. The negative and positive main contactor counterparts are P0AE0 and P0ADC.

Likely causes

Control wire shorted to 12 V supply
Driver stage stuck on in the battery controller
Outdated battery controller calibration

Symptoms

  • Vehicle may not start or become ready
  • MIL and hybrid warning on
  • Possible additional stuck-closed code P0AE2

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–5 h

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

Parts involved

hv battery precharge contactor awiring harnessbms

Related codes

P0AE6P0AE4P0AE5P0AE2P0ADCP0AE0

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com.