Picked up my 2019 Sierra AT4. I drove it off the lot, got about 3 miles. Stopped to get myself a cup of coffee. Got back into the truck, started it and the check engine light came on, the brake system failure, the ABS light, traction control etc. Called the dealer and was told to bring it back. (mind you, I've only actually owned the 63K truck for an hour) I bring the truck back, they take it in for about 20 mins and then the mechanic takes the car for a test drive. He's gonna about 15 minutes or so, comes back and says the truck is good. They fixed a recall recently but never "reset the computer" he says "you're good to go" I drive the 30 minutes home, pull up to the house, turn the truck off. Go inside to get my little ones because they want to go for a ride in daddy's new truck.. we go outside, I start the truck, and it's the same thing these are the codes that came up. It has been back to the dealer 3 times and they havem't found any issue. This is dangerous and something needs to be done. Service ESC service trailer brake brake system failure - 62 mph top speed steering assist reduced drive with care

- Franklin Square, NY, USA

On April 2, 2019 I parked brefily for about 30 minutes. Upon re-entering my 2019 GMC Sierra truck with approximately 4500 miles and starting the engine I immediately received multiple warning messages on my dash panel. They were "service ESC" "service trailer brake", "brake system failure" "steering assist reduced" and to drive no faster than 62 mph. Previously prior to parking I had never had any problems whatsoever. I was in a location where I needed to go so I attempted to drive but found quickly that the brake pedel went all the way to the floor with very limited or basically no braking. The steering became very difficult with no apparent power assist. I drove it approximately two miles and got to a location where I could park. I turned the engine off and back on and the problem did not go away. I turned it off again and waited a couple of minutes and then heard an automated couple of clunk sounds from the front.. I started it up and everything was okay except the check engine light was on and stayed on the rest of evening. The next morning the check engine light was still on however about twenty minutes later I noticed it was off and everything has been fine since. I had planned to take it to the GMC dealer however with no problem showing now and from past experience with the dealerships I decided there was no need to schedule an appointment until the symptoms come back. I found on the internet later that there are numerous instances where this has happened to many other 2019 GMC Sierra owners. I feel that this is a extremely serious problem that needs immediate attention especially with the near total braking system failure!

- Owensboro, KY, USA