Powertrain, generic · Hybrid propulsion

P0ABB Hybrid/EV Battery Pack Voltage Sense A Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0ABB is a plausibility check: the measured pack voltage is within electrical limits but does not agree with what the individual cells add up to. GM documents it in several hybrid tables. From 2016 the battery controller flags it when pack voltage and the sum of cell voltages differ by more than 10 V in 32 of 40 samples; the 2013 table compares the pack reading with 32 times the average cell voltage and uses a 5.49 V limit. Both are Type B, so the MIL needs two trips. The check is suppressed while cell voltage circuit faults are active. P0ABC and P0ABD cover hard low or high readings, P0AF8 compares the pack sensor with the inverter bus voltage.

Likely causes

Pack voltage measurement drifted (divider or input aging)
Faulty cell voltage tap distorting the cell sum
High-resistance busbar or sense connection

Symptoms

  • Check engine or hybrid system warning light
  • Erratic state-of-charge display
  • Reduced electric power

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–2,500
Time1–6 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

P0ABAP0ABCP0ABDP0ABEP0AF8

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