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.
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.
Common causes
- high
Safety event triggered disconnect
One of the most commonly reported causes for this code — check this first.
Typical part cost: $550-5500
- medium
Isolation fault detected
A plausible cause — test and verify before replacing parts.
Typical part cost: $550-5500
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does P2D39 mean?
P2D39 means "Forced Hybrid/EV Battery Disconnect". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.
What are the most common causes of P2D39?
safety event triggered disconnect; isolation fault detected; pack cell imbalance approaching service threshold — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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