I am aware of that. I just replaced one on a 6.0 Denali a few days ago.
What we still don't know is if there is an updated flash program that should be installed to correct a problem they found.
Here are the official installation instructions
Install the NEW throttle body gasket.
Install the throttle body.
NOTE: Refer to Fastener Notice in Service Precautions.
Install the throttle body nuts.
Tighten the nuts to 10 N.M (89 lb in).
Install the coolant air bleed hose to the throttle body.
Position the coolant air bleed hose clamp at the throttle body.
Connect the throttle actuator motor electrical connector (2).
IMPORTANT: Verify that the throttle actuator motor harness connector and the connector seal are properly installed and not damaged.
Install the engine sight shield.
Install the air cleaner outlet duct.
Refill the cooling system. Refer to Draining and Filling Cooling System in Cooling System.
Connect a scan tool in order to test for proper throttle-opening and throttle-closing range.
Operate the accelerator pedal and monitor the throttle angles. The accelerator pedal should operate freely, without binding, between a closed throttle, and a wide open throttle (WOT).
Verify that the vehicle meets the following conditions:
The vehicle is not in a reduced engine power mode.
The ignition is ON.
The engine is OFF.
Start the engine.
Inspect for coolant leaks.
Saturday, January 28th, 2012 AT 10:44 AM