P0B04

Electric/Auxiliary Transmission Fluid Pump Motor Phase V Current Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Uneven transmission operation
Check Engine Light Illuminates
Reduced shift efficiency
Noise from transmission fluid pump
Possible starting problems in hybrid systems

Causes

Pump motor malfunction
Damage to wiring or connectors
Problems with the control module
Short circuit in phase V circuit
Motor brush wear

How to Fix

Check the integrity of wiring and connectors
Measure the resistance of the motor windings
Check the operation of the control module
Replace the pump motor if necessary
Clean or replace connectors if corrosion is detected

Related codes

P0B00 P0B01 P0B02