P0BB0 code meaning
Hybrid/EV Battery Voltage Sense X Circuit Low
Powertrain system Generic code P0Bxx codes Check engine light
What P0BB0 means
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.
P0BB0 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0BB0
- Hybrid system warning and MIL
- Electric assist or propulsion reduced
- Charging not possible
Common causes of P0BB0
- Most likelyShort between sense lead X and a lower potential
- PossibleDefective measuring channel X in the monitoring electronics
- Less likelyCell X collapsed or internally shorted
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery voltage sense xWiring harnessBms
What each part of P0BB0 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B | Area: hybrid propulsion. |
| B0 | The exact fault in that area. |
What to do next
- Note P0BB0 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0BB0
What does P0BB0 mean?
P0BB0 means "Hybrid/EV Battery Voltage Sense X Circuit Low". When channel X reads too low, P0BB0 is stored. It is a generic code, so it means the same on every make.
Is it safe to drive with P0BB0?
Drive gently and only to a workshop. With P0BB0 the car can go into limp mode (reduced power) to protect itself.
Will P0BB0 fail an emissions test?
Yes, it can. P0BB0 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0BB0 to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0BB0 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.