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DTC codes / P0Bxx · Hybrid propulsion / P0B04

P0B04Electric/Auxiliary Transmission Fluid Pump Motor Phase V Current Low

P0B04 indicates that the vehicle's control module has detected an abnormally low current draw on phase V of the electric or auxiliary transmission fluid pump motor, which is the fifth phase in a multi-phase pump design. The computer compares expected current for that phase against the actual measured value and flags the code when the circuit is drawing less current than commanded, pointing to an open circuit, high resistance, or a failing pump motor winding.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
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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