2020 GMC Sierra 2500 Brakes Problems

The main tailgate will not go down or function properly and it says online there is a national recall for this, but does not come up when I search my vehicle. When I turn on my left turn signal the brights flash for no reason and this is a known major issue with the vehicles as well. The trucks computer is telling me low on coolant even though it is not that has already been fixed through a 3rd pARTY WARRANTY Parking brake was stuck on when I bought the vehicle and had been for a long time you could tell and I had to pay over $1100 to fix it at GM. The Ford collision system does not work properly and the cameras will come on at certain times when they're not supposed to be and not come on when they are supposed to be

NHTSA ID

11706292

Incident

Dec 19, 2025

Tires locking up while driving. NOT SAFE TO DRIVE

NHTSA ID

11628860

Incident

Oct 21, 2024

I HAVE A 5TH WHEEL WITH SOLAR AND MY BRAKE CONTROLER STOPS WORKING PERIODICALLY. I HAVE A CASE# WITH GM 9-13676268071. I ALSO HJAVE AN EXTENDED WARRANTY WITH GM AND IT'S NOT COVERED DUE TO MY VIN# NOT BEING ON A BULLENTIN# 23-NA-149. GM ALSO HAS A CUSTOMER SATISFACTION PROGREAM # N232414840 AND STILL WON'T COVER IT. THIS IS A MAJOR SAFETY ITEM AND CONCERN FOR ME.

NHTSA ID

11615574

Incident

Sep 9, 2024

The contact owns a 2020 GMC Sierra 2500. The contact stated that while driving 65 MPH, the message "Check Service Brakes Now" was displayed. The vehicle was taken to an independent mechanic, where it was diagnosed with electric parking brake malfunction. The mechanic informed the contact that the electric parking brake had been engaged unintendedly, causing the rear driver's side brake calipers to seize. The vehicle was repaired; however, the failure recurred on the rear passenger's side while driving. The vehicle was taken to the dealer, where it was diagnosed with electric parking brake circuitry failure. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 62,000.

NHTSA ID

11607029

Incident

May 31, 2024

Mileage

62,000 mi

My vehicle inadvertently locks the rear tires at highway speeds and then releases and drives. In some instances it may brake several times causing the tires to burn rubber for a short distance causing rear traffic to either swerve to avoid rear ending me and in a couple instances causes the rear following traffic to abruptly change lanes to avoid rear ending me

NHTSA ID

11580026

Incident

Mar 28, 2024

Service Trailer Brake System Alert constantly going off

NHTSA ID

11456261

Incident

Feb 5, 2022

Truck has had multiple issues related to the electrical system and truck modules. It is my opinion that these are all related to voltage issues or module problems. i have had multiple infotainment issues with delays loading, freezing up etc. dealer has ran updates and checks with nothing found. In October around $35k miles the truck Radio would not work if i used the push button start. if i shut the truck off opened the door and let everything reset i could push the start button in the truck and the radio would work majority of the time. The next day i went out to a completely dead truck. I talked to my service department at the local dealer and they said i would need to bring it in but suggested i disconnect the batteries and recharge the batteries. after doing so everything started working correctly. it fixed my radio problem and never went dead again. since then i have experienced popping noises through the speakers when playing music occasionally. over the last few weeks i noticed the engine does not attempt to increase cold idle speed until i press the brake to put it in gear. January 22nd i hit the autostart button and it did not work. i started the truck and it had CEL, Traction control, park brake and wrench, lights on with service emissions, and power reduced messages displayed. Truck is running odd. codes present are (ENGINE GMLAN)P0118 - engine coolant temp circuit high voltage, (BRAKES GMLAN_ABS) U0401- invalid data from engine control module, P0562- system voltage low, (HVAC CONTROLS GMLAN_HVAC) B1325 - . control module power circuit. Truck is starting and charging fine. No connection issues at batteries. There are many TSB's and many complaints regarding similar issues. common brake and emissions faults with minor differences. Module failures, communication faults, and or electrical faults are likely causing all of these similar issues. they need to be categorized as the same failure group which will show GM has a bigger issue.

NHTSA ID

11448544

Incident

Jan 22, 2022

While driving my 2020 GMC 2500 Denali with the Duramax Diesel engine, the power assist for the steering and brakes failed without any warning. This made the truck nearly impossible to steer and stop. Luckily, I was able to avoid a collision and get the truck stopped in a safe location. The truck is currently being towed to Rivard GMC in Tampa, Fl. Doing an internet search, I found this problem has happened to others as well. Please ask GM to rectify this extremely dangerous defect.

NHTSA ID

11421278

Incident

Jun 17, 2021

BRAKES SINCE NEW SQUEELED. TOOK TO DEALER AND DEALER SAID IT WAS NORMAL. HAVE HAD THE TRUCK ABOUT 11 MONTHS NOW. DEALER STATED GM NOW USES A DIFFERENT PAD MATERIAL AND I WOULD HAVE TO PAY FOR IT AT A COST OF CLOSE TO $1,000 TO REPLACE THE PADS.

NHTSA ID

11390937

Incident

Jan 27, 2021

Mileage

1,000 mi

MY BRAKES ARE SQUEAKING VERY LOUDLY THEY HAVE BEEN SINCE AUGUST. I WAS DRIVING DOWN THE ROAD ON US1 AND PREPARED TO STOP TO MAKE A TURN AND MY TRUCK WOULD NOT STOP. I WAS MAKING A RIGHT TURN AND ENDED UP IN THE OTHER LANE OF ONCOMING TRAFFIC SIDEWAYS BECAUSE I TRIED TO TURN MY TRUCK TO SLOW IT DOWN. I COMPLAINED ABOUT MY BRAKES SEVERAL TIMES TO THE DEALERSHIP THEY ORDERED ME NEW BRAKES WITHOUT EVEN LOOKING AT MY VEHICLE AROUND AUGUST 8TH. WE ARE NOW AT THE LAST TWO DAYS OF SEPTEMBER AND THEY STILL DO NOT KNOW WHEN THE BRAKES WILL COME IN. THIS IS A SERIOUS SAFETY ISSUE AT THIS POINT. I HAVE NO OTHER VEHICLE TO DRIVE. I BOUGHT A 70,000 TRUCK AND MY AND MY FAMILY'S SAFETY IS ON THE LINE. GMC NEEDS TO FIND ME A COMPARABLE LOANER VEHICLE UNTIL MY TRUCK IS REPAIRED.

NHTSA ID

11361606

Incident

Sep 28, 2020

Mileage

5,000 mi

TL* THE CONTACT OWNS A 2020 GMC SIERRA 2500. THE CONTACT STATED THAT WHILE DRIVING AND TOWING A TRAILER, SHE DISCOVERED THAT THE BRAKES WERE OVERHEATING. THERE WAS A STRONG BURNING HOT ODOR COMING FROM THE BRAKES. THE CONTACT PULLED OVER AND DISCOVERED ALL FOUR BRAKE ROTORS WERE EXTREMELY HOT. THE CONTACT DROVE AND DROPPED OFF THE TRAILER. THE CONTACT DROVE 20 MPH AND DOWN SHIFTED TO CONTROL THE SPEED TO GET BACK HOME. THE DEALER DAVE ARBOGAST BUICK-GMC (3540 S CO ROAD 25A, TROY, OH 45373, (937) 335-0068) STATED THAT INCORRECT BRAKE PADS WERE INSTALLED ON THE VEHICLE FROM THE FACTORY AND THERE WAS A TECHNICAL SERVICE BULLETIN FOR THE FAILURE. THE VEHICLE WAS NOT REPAIRED DUE TO THE REPLACEMENT PARTS NOT BEING AVAILABLE. THE MANUFACTURER WAS CONTACTED AND PROMISED TO PROVIDE A CALLBACK. THE FAILURE MILEAGE WAS 500.

NHTSA ID

11360930

Incident

Sep 18, 2020

Mileage

500 mi

TL* THE CONTACT OWNS A 2020 GMC SIERRA 2500. WHILE DRIVING 5 MPH, THE BRAKES ENGAGED AUTOMATICALLY AND THE TRACTION CONTROL WARNING INDICATOR ILLUMINATED. THE VEHICLE WAS TAKEN SEVERAL TIMES TO CARL BLACK CHEVROLET BUICK GMC (LOCATED AT 1110 ROBERTS BOULEVARD NORTHWEST, KENNESAW, GA 30144, (888) 457-2417). THE DEALER DIAGNOSED THAT THE SPEED SENSOR NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED, BUT THE FAILURE CONTINUED. THE DEALER DIAGNOSED THE VEHICLE AGAIN AND STATED THAT THE WHEEL HUBS NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED, BUT THE FAILURE RECURRED. THE DEALER DIAGNOSED THE VEHICLE A THIRD TIME AND STATED THAT AN UNKNOWN STEERING ANGLE SENSOR NEEDED TO BE UPDATED. THE VEHICLE WAS REPAIRED, BUT THE FAILURE CONTINUED. THE MANUFACTURER WAS INFORMED OF THE FAILURE. THE FAILURE MILEAGE WAS 571.

NHTSA ID

11282649

Incident

Aug 9, 2019

Mileage

571 mi