GM Service Manual Online
For 1990-2009 cars only

Oil Out the Vent Tube for GMC Truck Yukon XL - 2WD 2000

Checks

Cause

Pump Cover (206)

Cross channel leakage can pressurize the vent area.

Fluid

    • Foaming and filling the pump vent ports
    • Transmission is overfilled.

Transmission

Overheated