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DTC codes / P2Bxx · Hybrid propulsion / P2BD0
P2BD0 indicates that the battery charging system's negative contactor control circuit has a low voltage condition, meaning the powertrain control module (PCM) has detected a short to ground or an abnormally low voltage on the control wire for the negative contactor. This contactor is a high-current relay that connects and disconnects the battery's negative terminal from the vehicle's electrical system, often used in systems with dual batteries or complex power management. The PCM sets this code when the control circuit voltage falls below the expected threshold, which can prevent the contactor from closing and disrupt charging or power distribution.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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