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DTC codes / P2Bxx · Hybrid propulsion / P2B6C

P2B6CCoolant Pump D Overspeed/Air in System

P2B6C indicates that the powertrain control module has detected an overspeed condition on coolant pump D, or it has inferred that air is present in the cooling system based on pump performance feedback. The computer compares commanded pump speed with actual response and flags the circuit when the pump runs faster than expected or when speed fluctuations suggest a loss of liquid prime.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
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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