Brake pedal effort is increased, pedal gets hard and vehicle is hard to stop. Happens at slow speed. intermittently.

- Visalia, CA, USA

Trailer brake system message keeps showing up on my dash and it-??s not safely to drive

- Beatrice , NE, USA

I tried to buy a car at car dealershipin lafayette oregon ( Pouya Auto sales) gmc sierra 2015 black. on the date 02/09/2023. They soldme this car with ABS, cruscontrol, presusre tires ligths on dashbord. the financial bank recomend me to bring the veicule back to the dealership to have them to fixed.. they didnt want to continue with the contract anymore and canseled. now they want to sell the truck to some one else. and is not safe to drive it with this isuuses

- Vancouver , WA, USA

Hard break peddle at low speeds, break booster issue

- Greenville, SC, USA

Trailer Brake System Service.

- San Jose, CA, USA

When braking at low speeds I have no brakes to stop and i can feel a vibration in the brake pedal.

- Church Hill, TN, USA

Brake pedal is hard to push at low speeds

- Pasadena, MD, USA

At low speeds, like parking it lost all brakes. I have noticed a few times since the first. I see they had a recall for the brake vacumm pump but I cant find much on

- Weston, MO, USA

Brake vacuum fail, causing the brake pedal to become stiff and unable to stop the vehicle. This issue has been on the recall for the same year and make of truck as mine, yet mine is not eligible for this recall repair? Please help Thank you

- East Peoria , IL, USA

The Truck has something wrong with the Trailer braking system. with no notice it display "Service Trailer Braking system" in the DIC. This will cause loss of brakes to the trailer and make it very difficult to stop with the trailer. Everything functions properly and at a random moment they will just stop working.

- Hortonville, WI, USA

Trailer brake system Warning

- Atwood , IN, USA

Purchased GMC Sierra C1500 new in 2015 from a dealership in Orange County, CA. Experienced multiple issues over the past 4 years with the "Trailer Brake System" Service light and loud beeping which has created multiple safety issues making the vehicle undrivable at times. The last incident was while on a cross country road trip through extreme heat in the Southwest from Texas to California in June and most recently while visiting Orange County. The beeping noise almost caused a couple of accidents as the hands free phone system was inoperable due to the loud warning beeping noise as it went on and off about 50 times. We were required to take several risky maneuvers to pull the vehicle off heavy highway traffic at high speeds to stop the engine and restart in an attempt to reset the warning beeping system without success. The truck was checked in for service on 07.20.2022 at Tustin Buick GMC. Mr. John Boozer, Service Advisor. 714.669.3699. The total cost of repairs is $465 plus car rental of $80. Additional costs in April of 2019 for the repairs included fuse replacement, check of wiring harness and attempt to stop the beeping noise was $150. The defective wiring harness originally installed by GMC when the truck was built will be preserved and is available should your agency request it. Total costs out of pocket to replace or fix this factory defective part is $695. GMC has made no effort to address this issue or offer any recall notices related the failure of the "Trailer Brake Warning System". Thank you for your attention to this matter.

- Briarcliff, TX, USA

On July 18, 2022 my trailer brakes suddenly stopped functioning ( a few hours from home) Not only did did the trailer brakes stop functioning, but this warning message didn't popped up just one time, it kept coming again and again and again and again, relentlessy chiming and distracting me from driving. it covered my speedometer readout. it prevented me from receiving or making voice commands. the service warning chime also prevented the turn signal from functioning. So for a full 4 hours I was constantly reminded and was unable to receive calls or make voice commands. i absolutely wont hesitate to say the vehicle was not safe to drive in that condition. your vehicle's defect endangered my life. I will not hesitate to say your vehicle was not safe to drive in that condition. Your vehicles defect endangered my life! Lastly, my vehicle did not want to start the next morning!!

- San Antonio, TX, USA

My truck has just over 54,000 miles on it. I bought it new and have treated it well. It's my "Sunday" truck. Without warning, yesterday while carrying my wife to a doctor's appointment, as I pulled into a parking space to park... I had almost no brakes. I actually jumped on the emergency brake to aid me in getting stopped. After my wife had gone in for her appointment, I slowly moved the truck around the open areas of the parking lot trying to figure out what the problem was. I checked the brake fluid, looked to make sure I hadn't lost a brake pad or something else weird and found that everything was good. What I did find though was that the only time the truck had any issue was when I was moving under maybe 4 or 5 mph. And in fairness... I discovered the truck did have some tiny (but I do mean tiny) amount of braking ability at that low speed, but to say that the experience was unnerving would be a terrible understatement. Had someone been standing between me and the vehicle I was parking in front of when I experienced this, there is absolutely no doubt in my mind that I would have pinned them between our vehicles, or God forbid, something worse. I don't know what's going on here, but there's definitely something going on with the brake system at low speed on this GMC.

- Dobson, NC, USA

Trailer brake service alarm. Replaced module under stair tire and dash board. Still in alarm, internet says it-??s a common problem with wiring harness failure. Many others have some problem.

- Lorain, OH, USA

I keep getting a dashboard warning saying "service trailer brake system". from what i have found, this is due to an inexpensive wiring harness being used. It's very distracting and even if i dismiss the error, it keeps coming back up.

- Little Rock, AR, USA

Was driving in a parking lot. When driving slow My brakes got stiff and I couldn-??t stop it was so stiff it didn-??t want to stop I had my kids and wife. Scary and unsafe. Told GMC there was a recall they said it was already fixed with my situation. But just cuz you see on the computer it doesn-??t mean it-??s fixed. So they said I got to pay but it-??s in a recall already but properly not reboot right.

- Fife , WA, USA

Na

- Ny, CA, USA

Unknown

- Phoenix, AZ, USA

The brake pedal gets hard to push down when slowing down and especially when backing up slowly. After looking into some things I'm pretty sure the problem is with the vacuum pump.

- Maysville, KY, USA