01 What Happens If You Shift to Reverse While Driving at High … • 02 Understanding Why Cars Shut Off While Driving and Ensuring … • 03 Engineers Created Paint That Can Literally Generate Electri… • 04 How to tell if your spark plugs are bad: Signs, symptoms, a… • 05 What Causes the Check Engine Light to Come On? • 06 How to Save Money on Auto Repairs: Tips and Tricks • 07 Is it cheaper to run a generator on gas or propane? • 08 This Is Why Your Car’s Battery Terminals Are Corroded • 09 People Left Horrified After Discovering Why Airbags Sometim… • 10 B0022, B0024, and B0026: Left Front or Driver Frontal Deplo… •

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.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage