Powertrain, generic · Hybrid propulsion

P0AC0 Hybrid/EV Battery Pack Current Sensor A Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0AC0 belongs to the battery current sensor family, not to battery cooling. It reports a sensor whose reading is electrically valid but implausible. GM's 2011 to 2013 hybrid tables describe the check: with the contactors open, when no current can flow, the reading in each of the sensor's high, mid and low ranges must stay within 5 A of zero, and the controller also checks that the measured current fits the change in pack voltage. A failure sets the code as one-trip Type A in the 2013 table. The check waits while circuit codes P0AC1 or P0AC2 are active. Effects are a drifting charge estimate, reduced hybrid power and, in severe cases, a vehicle that will not go ready.

Likely causes

Current sensor zero offset drifted
Unstable sensor supply or reference voltage
Battery controller input fault

Symptoms

  • Hybrid system or check engine warning on
  • State of charge display drifts or jumps
  • Reduced electric assist

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

P0ABFP0AC1P0AC2P0AC3P0A1F

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