Powertrain, generic · Hybrid propulsion

P0AC1 Hybrid/EV Battery Pack Current Sensor A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0AC1 is set when the output of the pack current sensor falls below the valid window, so that the converted current would be an impossible discharge or charge value. GM documents it in several hybrid tables. In the 2016 and 2019 versions the Hall-effect sensor fails when the result is below -365.1 A for 8 of 10 samples at 25 ms with system voltage above 10.2 V; the code is Type A with MIL on the first trip. An earlier GM pack in the 2013 table uses an output below 0.2 V, equal to about -230 A, with 7 of 10 samples and Type B. Typical causes are a lost supply or a signal shorted to ground. P0AC2 is the high side and P0AC0 the plausibility check.

Likely causes

Sensor 5 V supply open or shorted
Signal wire shorted to ground
Hall current sensor failed internally

Symptoms

  • Hybrid system or check engine warning on
  • Electric drive limited or vehicle will not go ready

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–1,500
Time1–5 h

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

Parts involved

hv battery pack current sensor awiring harnessbms

Related codes

P0AC2P0AC0P0ABFP0AC3

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