P0B25Hybrid/EV Battery A Voltage 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
- P0B25 sets when the voltage of hybrid/EV battery A drops below the window the controller expects. Bentley uses it in two different systems. In the 48 V Bentley Dynamic Ride anti-roll system it is stored in address 0021 (battery energy control module 2); if the highest and lowest cell readings differ by 0.5 V or more, an internal fault of the super capacitor is assumed and it is replaced. On the Bentayga and Flying Spur Hybrid the code appears in 008C, the high-voltage battery manager, with MIL and red battery warning, and the workshop must involve Bentley product support. GM checks pack undervoltage analogously with P0ABC (below 24 V). Unstable and high readings are P0B24 and P0B26. The driver loses roll control or battery power.
- What you may notice
- Bentley Dynamic Ride fault warning, roll control inactive
- MIL on
- Hybrid/EV system or high-voltage battery warning on
- Battery power limited, less electric drive or assist
- Likely causes
- LikelyInternal fault of the energy store, e.g. Bentley 48 V super capacitor
- PossibleAged or unbalanced cells pulling the unit voltage down
- PossibleDeep discharge after long standstill
- RareVoltage measurement fault in the controller or sense leads
- 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: €300 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.