P0BBAHybrid/EV Battery Voltage Sense Z 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
- P0BBA is stored when the voltage measured on channel Z falls below the lower limit. In the 16OBDG02 programme the hybrid processor checks Z every 100 ms and fails it below 0.20 V in 14 of 18 samples, a Type A fault, but only with a system voltage above 10.20 V and no open-circuit fault on the cell. GM's 2019 battery energy control module and the 2011 Volt use 0.2 V or less over 1.4 s within 2 s. This rules out a simple open lead, which would have set P0BB8 first. What remains is a short in the Z wiring or connector, a failed channel on the monitoring board or a cell whose voltage has actually collapsed. The battery is normally limited to protect the other cells.
- What you may notice
- MIL and hybrid or EV warning
- Limited power and charging
- Likely causes
- LikelyShort in the Z sense wiring or connector
- PossibleFailed channel Z on the monitoring board
- RareVoltage collapse of cell Z
- 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.