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DTC codes / P2Bxx · Hybrid propulsion / P2BD1

P2BD1Battery Charging System Negative Contactor B Control Circuit High

P2BD1 indicates that the battery charging system's negative contactor control circuit is reporting a high voltage condition, meaning the control module sees the circuit at or near battery voltage when it expects a low or grounded state. The computer detects this by monitoring the control wire for the negative contactor, which is a relay or solid-state switch that connects the high-voltage battery's negative side to the charging system, and it sets the code when the commanded state and actual voltage disagree.

SystemPowertrain
Code typeGeneric (all makes)
SeverityHigh
Fix difficultyProfessional
AreaHybrid propulsion

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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