One problem related to ignition has been reported for the 2006 Chevrolet Avalanche.
The most recently reported issues are listed below.
1 Ignition problem
Failure Date: 08/04/2012
Hvac blower did not function on certain or all blower speeds. The hvac blower ran continually with the ignition in the off position and the key removed.
Other Electrical System related problems of the 2006 Chevrolet Avalanche