Why is the exclamation warning light on?
I'd toy read the Manuel for the vehicle, it's the tire pressure warning light
SOURCE: 2008 GMC Sierra 1500 50,644 miles check
This problem seems to be the ECM (computer) to have so many things acting up at the same time. Did it all start at the same time? Its possible that you can reset the ECM by removing the hot and ground cables, wait about 15 minutes and then replace them, may fix the problem, may only temporarily fix the problem if the ecm is bad or something is setting a code to cause this. It sounds as if it is running in limp mode. Have it tested at the nearest parts store. They should be able to decipher the problem.
Testimonial: "Thank you....everything did start at one time How much do you think it will cost to have it repaired"
SOURCE: 2003 gmc envoy rear lights won't turn off
As for the brake lights i would think that the brake light switch is faulty.As for the parking lights i think that the parking light relay is sticking.Switch the relay with another one in the fuse panel with the same part number to see if thats the problem or not.
SOURCE: How do I tune up my 2008 GMC Envoy
Go to www.autozone.com an sign up then click on repair info.
blown brake line or hose, leaking caliper, many possibilities
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