P0BBB code meaning
Hybrid/EV Battery Voltage Sense Z Circuit High
Powertrain system Generic code P0Bxx codes Check engine light
What P0BBB means
If the Z channel shows a cell voltage above the upper limit, the controller sets P0BBB. The 2016 Volt battery module uses 4.8 V or more for 1.4 s in a 2 s window, Type A, and checks first that the cell monitoring slave is communicating and no open sense line is reported. The 16OBDG02 programme fails above 4.90 V in 14 of 18 samples, and the eAssist mild hybrid fails above 4.65 V in seven of ten samples with a healthy 12 V supply, Type B over two trips. Lithium-ion cells are not meant to exceed these values, so the reading normally points to a short towards the higher neighbour, a faulty input or a corrupted measurement, and only rarely to a truly overcharged cell. Charging is stopped as a precaution.
P0BBB 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 P0BBB
- MIL and charging stopped
- Reduced regeneration
Common causes of P0BBB
- Most likelySense lead Z shorted towards the higher neighbour cell
- PossibleFaulty measuring input Z
- Less likelyCell Z overcharged
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 zWiring harnessBms
What each part of P0BBB 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. |
| BB | The exact fault in that area. |
What to do next
- Note P0BBB 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 P0BBB
What does P0BBB mean?
P0BBB means "Hybrid/EV Battery Voltage Sense Z Circuit High". If the Z channel shows a cell voltage above the upper limit, the controller sets P0BBB. It is a generic code, so it means the same on every make.
Is it safe to drive with P0BBB?
Drive gently and only to a workshop. With P0BBB the car can go into limp mode (reduced power) to protect itself.
Will P0BBB fail an emissions test?
Yes, it can. P0BBB 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 P0BBB to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0BBB clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.