Powertrain, generic · Hybrid propulsion

P0BB0 Hybrid/EV Battery Voltage Sense X Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

When channel X reads too low, P0BB0 is stored. In GM's eAssist mild hybrid the battery interface module sets it below 1.4 V in seven of ten samples at 200 ms, provided the 12 V system is above 8.8 V and the group fault P1B38 is not active, as a two-trip Type B fault. The 2011 Volt and the 16OBDG02 programme work with a far lower limit of about 0.2 V, the latter in 14 of 18 samples at 100 ms, Type A. That difference reflects the cell chemistry and how much voltage a healthy cell can lose. Because an open lead is caught first by P0BAE, a stand-alone P0BB0 is more often a short in the sense harness, a failed input or a cell that has collapsed. Expect reduced power and blocked charging.

Likely causes

Short between sense lead X and a lower potential
Defective measuring channel X in the monitoring electronics
Cell X collapsed or internally shorted

Symptoms

  • Hybrid system warning and MIL
  • Electric assist or propulsion reduced
  • Charging not possible

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–6,000
Time1–8 h

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

Parts involved

hv battery voltage sense xwiring harnessbms

Related codes

P0BAEP0BAFP0BB1P0BB2P0BABP0BB5

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