Holy crap. That is unbelievable. I opened this thread because I have the same warning as others. Service Parking Brake, with the little wrench icon. WTF is going on with these GM trucks. I just had the driver side cooling fan replaced at 40k miles on the truck. Out of warranty. Now this light is on. Disconnected the negative terminal on the battery, did nothing. After a lifetime of GM trucks, this may be my last. I can't keep worrying about some random stupid electronic failure, and all the time to bring it to the dealer and cost. 43,900 miles on the truck and at the dealer twice now. Is there a final solution to this issue? And please don't respond that you lost engine power etc, that is not happening with me.