P0B2BHybrid/EV Battery C 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
- P0B2B is the general voltage fault of hybrid/EV battery C, the third sub-battery or energy store that a controller can monitor on its own. It signals an implausible voltage of this unit without the detail given by P0B2C (unstable), P0B2D (low) or P0B2E (high). Which modules form battery C, and whether a vehicle has a third unit at all, depends on the manufacturer; no manufacturer documents P0B2B publicly. As a reference GM monitors the voltage of the whole pack with P0ABB to P0ABD, among them a plausibility check against the cell sum. CARB requires voltage sensors and cells of hybrid storage to be monitored and faults to point to the replaceable unit. Expect a hybrid warning and limited battery power.
- 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 C
- PossibleFault in the voltage sense leads or connectors of battery C
- 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.