When you start your truck up let it warm up you start driving down the road and you touch the brakes and the RPM start going up and down up and down with vehicle dying sporadically

- Silt, CO, USA

Vehicle won't start after it shut off while driving on frwy. Pull over and started after a few minutes like nothing had happened

- Beaumont, CA, USA

The vehicle has 9 bolts holding the exhaust manifold to the engine. The owner smelled strong exhaust smell in the cabin. He removed the exhaust manifold from vehicle and found that 4 of the 9 bolts had failed and were broken off flush with the engine block. There was exhaust residue in the immediate area of the 1st and 5th cylinder port indicating that exhaust gas was being discharged into the engine bay. The failure is an alarming safety event because of the potential for hot exhaust to cause a fire in the engine compartment and the potential for asphyxiation due to contaminated cabin air. This is also an environmental control failure because a portion of the exhaust gas iss bypassing the catalytic converters. The owner is the original owner and all equipment is original. He is a degreed mechanical engineer and has worked in automotive component manufacturing. GM was contacted directly and the owner directed to see the dealership. The owner provided the dealership with the attached photos but then refused to inspect the vechicle without first collecting a "diagnostic fee." The owner refused.

- Murfreesboro, TN, USA

Vehicle cranks but does not start. Security light flashing. After 10 minutes with key on and security light off after turning off then crank engine starts. Happened at least 15 times. Now, engine sometimes will crank itself in the "on" position and will not start and security light flashing. Happened three times and finally after three 10 minute key on wait cycles in a dark parking lot security light stopped flashing and started and made it home. Vehicle very unreliable now. I am tired of having a vehicle that thinks the owner is trying to steal owned vehicle. And auto crank in the on - not start- position without running. How do I bypass this awful system without another car payment to another automaker? this defect is dangerous and hazardous when stopping for fuel and have to leave engine on or holding up customers until engine starts. Also holding up vehicles on a ferry boat. Very embarrassing when friends and co workers have to wait till vehicle decides to start and run. And being late to work. I do not want new parts that will fail again, I want it bypassed. Send me a kit with directions asap!

- Uvalde, TX, USA

The truck experiences engine stutter at low idle (>1000rpms) varying from 1000 rpms to 200 rpms with felt loss of power steering at low rpms. At lower rpms, typically at stops or low idle turns, the truck will stall with loss of power steering and brake control (tapping the brake equals slamming the brake). Recently, the issue is now becoming more frequent and now occurring while making low idle turns into traffic causing a stall. The only resolution is to drop the truck in neutral, in traffic, and restart hoping the bump start will occur on the first try before being hit from behind. I have called GM service shops, the service center in detroit as well as looked for recalls online and there are no official postings or knowledge of these problems despite numerous individual accounts found in GMC/Chevy forums. This issue is a dangerous issue in my opinion and needs to be addressed.

- St. Louis, MO, USA