OBD-II code · Powertrain (generic, extended)
P2D39 Forced Hybrid/EV Battery Disconnect
The BMS has forced a disconnect of the high-voltage battery from the vehicle bus. Triggered by safety condition such as overcurrent, isolation fault, or thermal runaway.
Is it safe to drive with P2D39?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySafety event triggered disconnect
- PossibleIsolation fault detected
- 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, Main Contactors, Bms
Related codes
- P2D36Hybrid/EV Battery Inductive Charger Output Voltage Performance
- P2D37Hybrid/EV Battery Inductive Charger Input Circuit Range/Performance
- P2D38Hybrid/EV Battery Pack Heater Performance
- P2D3AForced Hybrid/EV System Shutdown
- P2D3BHybrid/EV Discharge System Fault
- P2D3CCold Start Hybrid/EV Drive Motor Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.