P0B23Hybrid/EV Battery A Voltage
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B23 is the general fault for the voltage of hybrid/EV battery A, the first of up to four sub-batteries or energy stores (A to D) that the battery controller evaluates separately; which physical unit carries the letter is up to the manufacturer. The code says that the measured voltage of this unit no longer fits the expected value, without the finer split into unstable (P0B24), low (P0B25) or high (P0B26). No manufacturer documents P0B23 publicly; Bentley and Stellantis bulletins only show the specific siblings. GM watches the comparable whole-pack voltage with P0ABB to P0ABD. CARB requires the voltage sensors and cells of the hybrid storage to be monitored, with fault codes that point to the smallest replaceable unit.
- What you may notice
- Hybrid/EV system or high-voltage battery warning on
- MIL on
- Battery power limited, less electric drive or assist
- Charging or recuperation restricted
- Likely causes
- PossibleWeak or failing cells or module in battery A
- PossibleFault in the voltage sense leads or connectors of battery A
- RareBattery controller software or internal measurement fault
- 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 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.