P0BB0Hybrid/EV Battery Voltage Sense X Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Hybrid system warning and MIL
- Electric assist or propulsion reduced
- Charging not possible
- Likely causes
- LikelyShort between sense lead X and a lower potential
- PossibleDefective measuring channel X in the monitoring electronics
- RareCell X collapsed or internally shorted
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.