Two problems related to ignition switch have been reported for the 2003 Chevrolet Avalanche. The most recently reported issues are listed below.
I believe the same problem with the gm key/ignition switch is more common then what is being reported. The Avalanche 2003 has had the same loose ignition switch for years. Our key system has to be jiggled and forced to the start position 80 percent of the time. The ignition switch will also move the off position while the vehicle is moving and the key will fall out.
Key ignition switch is loose and car will shut off while operating, key can be pulled out of ignition while running. If vehicle shuts off while operating then you loose control of brakes, steering, and electrical systems. Gm is denying there is a problem. My vehicle is proof that the problem exists and the chevy Avalanche 2003 has a problem.