2005 Chevrolet Trailblazer EXT 370 problems

The contact owns a 2005 Chevrolet Trailblazer EXT 370. The contact stated that the when there was moisture in the air, the driver side master switch failed to operate without warning. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and stated that the vin was not included in nhtsa campaign number: 13v248000 (electrical system, visibility). The failure mileage was 139,000. Electrical system · reported at 139,000 miles

My speedometer has quit working. It will register 30mph and I'm probably going 70 when I'm keeping up with the traffic on the highway. Most of the time it doesn't work at all. This just started on the 25th of december. We have noticed on the internet that this is happening to several gm vehicles. There is other recalls on these other vehicles and we think the 2005 trailblazer should also be included. Electrical system · reported at 103,000 miles

Purchased the 2005 trailblazer with 49,000 miles. At 50,000 miles the speedometer stopped working properly. When I slowed down from going 70 miles per hour, the needle stayed on 70 and when I accelerated it would act as though 70 was the new 0. Now the speedometer points down past the 120 mph mark and will not budge. Gm told me that it not under warranty and it will cost over $500 to fix. Electrical system · reported at 50,000 miles