Powertrain, generic · Hybrid propulsion

P0ABF Hybrid/EV Battery Pack Current Sensor A Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

The pack current sensor, usually a Hall-effect unit around the main cable, tells the battery controller how much current flows in and out. P0ABF is the general fault of sensor A. GM uses it in its 2019 hybrid controller tables as a stuck-in-range check: before the high-voltage bus is precharged the controller stores a zero-current baseline, then expects a measurable change once precharge starts or the main contactor closes and loads such as the inverter and auxiliary power module draw current. If the reading moves by less than 1 A, P0ABF fails. Out-of-range readings are P0AC1 and P0AC2, offset errors P0AC0. Without a valid current value state of charge cannot be tracked, so power is limited.

Likely causes

Hall current sensor output frozen
Sensor supply, ground or signal wire faulty
Sensor not seated around the conductor after repair

Symptoms

  • Hybrid system or check engine warning on
  • Reduced electric power and erratic charge display
  • Vehicle may 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

P0AC0P0AC1P0AC2P0AC3P0A1F

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