One problem related to ignition has been reported for the 2005 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 GMC Sierra 1500 based on all problems reported for the 2005 Sierra 1500.
The speedometer of my GMC Sierra 1500 is erratic when it is wet outside. When the vehicle is parked and the ignition key is in my pocket the speedometer reads anywhere from 40 to 50 mph. While driving the speedometer indicates up to 120 mph. How many people have to complain about this safety concern before something is done. A search of your database indicates many complaints. Help.