OBD-II code · Powertrain (generic)
P0B30 Hybrid/EV Battery D Voltage Unstable
The voltage measurement of HV battery D fluctuates beyond the expected window. Loose connection or unstable cell.
Is it safe to drive with P0B30?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyLoose busbar or terminal connection
- PossibleCell with unstable internal resistance
- Less likelyPack cell imbalance approaching service threshold
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–16 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery D, Bms
Related codes
- P0B24Hybrid/EV Battery A Voltage Unstable
- P0B28Hybrid/EV Battery B Voltage Unstable
- P0B2CHybrid/EV Battery C Voltage Unstable
- P0B2DHybrid/EV Battery C Voltage Low
- P0B2EHybrid/EV Battery C Voltage High
- P0B2FHybrid/EV Battery D Voltage
- P0B31Hybrid/EV Battery D Voltage Low
- P0B32Hybrid/EV Battery D Voltage High
- P0B33High Voltage Service Disconnect Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.