Powertrain, generic · Hybrid propulsion

P0ABC Hybrid/EV Battery Pack Voltage Sense A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0ABC is stored when the pack voltage sensor reports a value below anything the battery could really have, pointing to a short to ground or a lost sense signal rather than a discharged pack. GM's 2016 and 2019 hybrid tables set it below 4.8 V with system voltage above 10.2 V, after 8 failed samples out of 10 taken every 25 ms, and rate it Type A with MIL on the first trip. The 2013 table for an earlier hybrid uses a limit of 30 V, 7 of 10 samples and Type B. A real deep discharge is handled by other codes such as P0AFA. Because the controller no longer trusts pack voltage, hybrid operation is restricted or the vehicle will not go ready.

Likely causes

Sense line shorted to ground or disconnected
Sense fuse or link open so no voltage reaches the input
Battery controller measurement input defective

Symptoms

  • Hybrid system or check engine warning on
  • Vehicle may refuse to enter ready mode
  • Engine runs continuously, no electric drive

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–2,000
Time1–5 h

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

Parts involved

hv battery pack voltage sense awiring harnessbms

Related codes

P0ABDP0ABBP0ABAP0ABEP0AFA

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