P277B

Electric/Auxiliary Transmission Fluid Pump B Driver Circuit Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine light comes on
Gear shifting problems
Transmission transition to emergency mode
Unusual noises from the transmission area
Reduced transmission efficiency

Causes

Transmission Fluid Auxiliary Pump B Malfunction
Open or short circuit in the pump control circuit
Pump relay or fuse problems
Transmission control module (TCM) malfunction
Poor contact in pump circuit connectors

How to Fix

Check fuses and relays associated with the pump
Diagnose the electrical circuit of the pump for opens and short circuits
Check the connectors and connections in the pump circuit
Test the operation of the transmission fluid pump itself
If necessary, replace the pump or repair the electrical circuit

Related codes

P277A P277C P277D