P0B2DHybrid/EV Battery C 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
- P0B2D means the voltage of hybrid/EV battery C is too low compared with what the controller expects. High readings of the same unit are P0B2E, fluctuating ones P0B2C. No manufacturer documents P0B2D publicly; the nearest published case is Bentley's P0B25 for battery A, where a 0.5 V spread between highest and lowest cell points to a defective energy store. GM's corresponding whole-pack check is P0ABC (pack below 24 V). CARB requires that cells and voltage sensors of hybrid storage are monitored and that faults identify the smallest replaceable unit. A worn or deeply discharged module in unit C is the most likely reason. The controller lowers discharge power, so acceleration in electric mode suffers and the engine may run more often.
- What you may notice
- Hybrid/EV system or high-voltage battery warning on
- MIL on
- Battery power limited, less electric drive or assist
- Combustion engine runs more often (hybrid)
- Likely causes
- LikelyAged cells with lost capacity in battery C
- PossibleDeep discharge or self-discharge after 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: €100 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.