Similar to others on this site, for no good reason my 2019 GMC Sierra started giving me ABS brake failure, ESC failure, steering issues, Traction Control failure, etc. Dash lit up like Christmas tree! I contact On-Star and they confirm that, yes, I have multi-system failure after they performed a remote diagnostics check. ADVICE: Go to dealer... which is where my $70K vehicle is currently. Never had such problems for the last 20y driving Toyota and Honda vehicles, but thought I would go American. Love the truck... but not so much IF as WHEN it's going to be a frequent service shop visitor.

Bought truck on 4-18-19. Had no problems or issues until truck reached 6500 miles. I drove the truck to purchase some items. When I started the truck to return home most of the dash lights were on such as brake failure. The vehicle will not go past 62 mph, there's no assist steering info, and trailer brake failure (no trailer this time).

I called Sutherland Chevrolet on 11-11-19 because they are the closest GM dealer to me that I have faith will do the repairs correctly. The service writer (which is a good friend) sent a wrecker to pick up the truck. I went to start the truck and it would not start. The starter would engage and stayed on for I guess 30-40 seconds. After 3 attempts, we did not want to damage the starter.

They winched the truck up on the wrecker and delivered it to the Southerland Chevrolet. I did not purchase the truck there as they are not GMC dealer so I knew they had others in front of me. The repairs were done on 11-15-19 and I picked the truck up on 11-18-19. I drove it maybe 75 miles - and it's doing the exact same thing.

SO... where do we go from here? Do I have confidence in the dealer? ABSOLUTELY. Do I think this could be a danger to drive after they try again? "HELL YES". WE need GM to step up to the plate and guarantee this will never happen again to this vehicle after the repairs are done. This is my 4th GMC truck and now I wish I had my old truck back, a 2014 G.M.C Denali. I will keep you posted with follow up details.

While turning left from a gas station and entering I40, I lost all brake pedal pressure. The vehicle would not stop, and I managed to get the vehicle to roll to a stop in the median. The dash read "brake system failure 62mph top speed", "service trailer brake system", "steering assist is reduced drive with care" and "service ESC". The power steering was very tough to steer, and the braking was super reduced with full weight on brake to try and get vehicle to stop.

At least the side curtain airbags did not deploy like my 2014 Sierra 1500 did.

Problem occurred twice. Both times the failure modes, codes, and messages were the same and was accompanied by an increase in pedal travel and pedal sponginess. There was an MIL lamp, Traction Control Lamp, Red Brake Lamp and three repeating cluster messages: Service Brake Assist, Service ESC, and Brake System Failure 63 MPH Top Speed First visit to dealer was a two hour wait then a No Problem Found. Problem re-occurred a couple weeks later on 8/30/19. Brought it back to the dealer Laura Buick GMC, Collinsville, IL and they put me in a loaner. After hearing nothing for a week I called them. The SA, who sounded like he didn't really understand what he was talking about said this is a known issue, they have three of these issues in the shop and it is due to a production problem. He said they have a Master Cylinder and an ABS ECU (EBCM) on order but none are available and they have no idea when they will be available. The SA led me to believe the root cause is undetermined and they are throwing some parts at it.

Update from Nov 21, 2019: After 5 weeks, a GM strike and then a dealership mechanic strike the backordered part came in which was the master cylinder/EBCM/HCU - a one piece integral unit. They had someone install the part which was reportedly due to "an internal short" in the EBCM. Supposedly it is a known issue and the particular dealer had 2 or 3 vehicles exhibiting this condition.

Just around a month after having my new truck and now I have been out of it a week. In the parking lot at work as I was leaving for lunch (and many other people) I get service lights and brake system failure and the pedal goes to the floor. I'm beeping at people walking over the curb like a jackass because I didn't know if I was going to be able to stop. I call Wiesner in Conroe, TX and they say, get roadside to tow it up here and we will look at it. Frustrated, I drive the 4.3 miles and drop it off. Told them damn near hit someone due to the brakes. Fella got in and said weird, we haven't seen anything like this before. I've called everyday and they have yet to explain the real answer. Vacuum pump, waiting on a piece from North Carolina, etc. I'm paying my loan payments and you got me in some small loaner vehicle and cant tell me whats wrong or when I get it back, come on GM, this is why we buy GM products. As I read all the similar complaints how is this not a recall? I have a family I transport and the last thing they want to do is ride in a faulty vehicle. The dealership and GM need to make good here. Hell, Id take my old vehicle back to ensure my safety. This has to be fixed. Brake System Failure at 2500 miles and actually having to replace a part. Shoot, if it was a software thing I'd be a little less judgmental, what the hell kinda part needs replaced at less the 3k? Ridiculous. Get it fixed.

WE HAVE ONLY HAD THE VEHICLE LESS THAN 3 MONTHS AND WHEN LEAVING FOR WORK IN THE MORNING THE BRAKE PEDAL WAS EXTREMELY HARD. ALSO THE FOLLOWING ERRORS CAME UP, TRAILER BRAKE MALFUNCTION DO NOT DRIVE VEHICLE OVER 62 Mph, BRAKE LIGHT, TRACTION CONTROL DISABLED, ABS MALFUNCTION. WAS TOLD IT WOULD TAKE 2 DAYS FOR PART AND WHEN I PICKED UP LOANER THEY CHANGED THAT TO 5 DAYS BECAUSE NONE OF THE DEALERS CARRY THE PART. WELL TODAY HAS BEEN A WEEK AND STILL NOTHING ON MY TRUCK. HOPE THIS GETS RESOLVED SOON SO I CAN ENJOY MY TRUCK I AM PAYING FOR AND NOT A LOANER.