CTS Wagon RWD V6-3.6L (2010)
6. Remove the transmission vent hose from the retaining clips (6) on the transmission support.
7. Disconnect the transmission wiring harness connector (4) from the transmission by releasing the locking mechanism and rotating the latch
counterclockwise.
8. Remove the wiring harness retainers (1) from the transmission.
9. Remove the oxygen sensor wiring harness connector (2) from the transmission.
10. Place an oil drain pan under the transmission fluid cooler pipes.