P27A4

Electric/Auxiliary Transmission Fluid Pump B Control Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check engine light comes on
Deterioration of gear shifting
Reduced transmission efficiency
Possible noise from the pump
Limitation of transmission functionality

Causes

Auxiliary transmission fluid pump B malfunction
Open or short circuit in control circuit
Poor contact in pump connectors
Faulty relay or fuse
Problems with the transmission control unit

How to Fix

Check the condition of fuses and relays
Inspect the wiring harness and pump connectors for damage.
Check the resistance and functionality of the pump
Scan the control unit for additional errors
If necessary, replace the pump or repair the wiring

Related codes

P27A0 P27A1 P27A2 P27A3