P277A

Electric/Auxiliary Transmission Fluid Pump B Hydraulic Leakage

Severity

⚠️ Medium

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Difficulty shifting gears
Reduced transmission performance
Noises in the transmission area
Dashboard warning light
Problems starting the engine in cold weather

Causes

Damaged pump seals or gaskets
Wear or damage to the pump itself
Problems with the electrical part of the pump
Transmission fluid leak
Damage to hydraulic lines

How to Fix

Check the level and condition of the transmission fluid
Inspect the pump and its seals for leaks
Check electrical connections and wiring of the pump
If necessary, replace the pump or its components
After repair, check the operation of the transmission

Related codes

P2770 P2775 P2779