2020 Gmc SIERRA 2500 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
74 owner complaints analyzed
9 distinct recall campaigns
28,600 mi median reported failure mileage
Scope: 2020 model year. Data snapshot: . 24 complaints include usable failure mileage.
Most common problems
Power Train is the most frequently named component, appearing in 22 of 74 complaints (29.7%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Braking behavior | 18 | 24.3% |
| Transmission and shifting | 16 | 21.6% |
| Electrical and battery issues | 6 | 8.1% |
| Steering behavior | 6 | 8.1% |
| Fuel system concerns | 1 | 1.4% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Power Train | 22 |
| Unknown Or Other | 16 |
| Electrical System | 13 |
| Service Brakes | 12 |
| Engine | 10 |
| Steering | 6 |
| Structure:Body | 4 |
| Vehicle Speed Control | 3 |
Power Train: 22; Unknown Or Other: 16; Electrical System: 13; Service Brakes: 12; Engine: 10; Steering: 6; Structure:Body: 4; Vehicle Speed Control: 3
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 11 |
| 25,000 to 49,999 | 2 |
| 50,000 to 74,999 | 2 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 8 |
| 150,000 and above | 1 |
Under 25,000: 11; 25,000 to 49,999: 2; 50,000 to 74,999: 2; 75,000 to 99,999: 0; 100,000 to 149,999: 8; 150,000 and above: 1
Under 25,000 miles has the most reports with usable mileage (11). 50 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2019 | 1 |
| 2020 | 8 |
| 2021 | 7 |
| 2022 | 8 |
| 2023 | 7 |
| 2024 | 10 |
| 2025 | 29 |
| 2026 | 4 |
2019: 1; 2020: 8; 2021: 7; 2022: 8; 2023: 7; 2024: 10; 2025: 29; 2026: 4
Pattern summary
Power Train leads the component reports. Braking behavior appears in 18 complaint narratives. Transmission and shifting appears in 16 complaint narratives. Electrical and battery issues appears in 6 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11282649 · 2019-11-27 (November 27, 2019)
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, [phone removed]). 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…
Owner-reported narrative. 571 miles reported. Look up ODI 11282649 at NHTSA ↗
Owner report 11360146 · 2020-09-21 (September 21, 2020)
2020 GMC SIERRA DENALI DURAMAX 3000 MILES TRIED TURNING ON TRUCK THIS MORNING TO GO TO WORK AND WOULD NOT EVEN CRANK IT IS A PUSH START OPTION HAVE NO CLUE ON HOW IM GOING TO TAKE IT TO THE DEALERSHIP IF I CANT GET IT OF PARK INTO NEUTRAL FOR A TOW TRUCK AT LEAST ! TRUCK DOES NOT CRANK IT THROWS ME A TON OF MESSAGES STABILITY TRAK DSC ABS POWER REDUCED 4WD CHECK TRAILER LIGHTS. BUNCH OF MESSAGES I TOOK VIDEO OF IT AND SO TRUCK DOESN'T EVEN TRY TO START. I TOOK A VIDEO OR THE PROBLEM
Owner-reported narrative. Look up ODI 11360146 at NHTSA ↗
Owner report 11603243 · 2024-07-18 (July 18, 2024)
Well, we ended up having a problem with our transmission in our 2020 truck. I am the wife and I was driving down the highway and all of a sudden the truck started bucking and went down to 35 mph. I was in a middle lane on the highway when this happened which Was very scary! Then I was stranded along side the highway until I could get help. Here we found that our transmission went out already only after four years, which is crazy. Very crazy! We bought this truck because we were told with the weight of this truck and all that it would pull out …
Owner-reported narrative. Look up ODI 11603243 at NHTSA ↗
Owner report 11626451 · 2024-11-20 (November 20, 2024)
The contact owns a 2020 GMC Sierra 2500. The contact stated while driving approximately 65 MPH, the vehicle lost motive power. The contact stated that he had not depressed the brake pedal. The contact was towing a 20-foot flatbed trailer with a load of lumber of approximately 4,000 lbs. in weight. The contact stated there was no warning light illuminated. The contact pulled over with the vehicle still running and attempted to shift into drive(D) and reverse(R); however, the vehicle failed to respond. The contact stated that after shifting into …
Owner-reported narrative. 100,000 miles reported. Look up ODI 11626451 at NHTSA ↗
Owner report 11382789 · 2020-12-09 (December 9, 2020)
WENT OUT TO MY VEHICLE THAT HAS BEEN SITTING IN MY DRIVEWAY FOR 24 HOURS AND ATTEMPTED TO UNLOCK IT WITH THE KEY FOB. NOTHING. TRIED THE OTHER FOB. NOTHING. USED THE KEY TO UNLOCK THE DOOR AND GET IN TO PUSH BUTTON START AND NOTHING. I PLUGGED BOTH BATTERIES INTO CHARGERS AND THEY WOULD START TO CHARGE, THEN DISCHARGE AFTER THE BATTERIES GOT UP TO ABOUT 20% I CALLED GMC ROADSIDE ASSISTANCE AND THEY SENT SOMEONE OUT. THE SERVICE GUY SHOWED UP ABOUT 45 MIN LATER AND HOOKED UP A JUMP BOX TO EACH BATTERY. STILL NO LUCK IN GETTING IT STARTED.…
Owner-reported narrative. 9,200 miles reported. Look up ODI 11382789 at NHTSA ↗
Owner report 11396147 · 2021-02-14 (February 14, 2021)
THE SCREEN ON MY TRUCK HAS GONE BLANK SEVERAL TIMES AND THE VOLUME ON THE RADIO GOES SUPER LOAD AND THE ONLY WAY TO STOP IT SEEMS TO BE TO STOP AND TURN OFF THE TRUCK, OPEN THE DOORS AND RE START TRUCK. TODAY, I COULDN'T GET MY SCREEN TO GO OFF IN MY TRUCK WHEN I TURNED IT OFF, I TRIED TURNING OFF, RESTARTING ETC BUT TO NO AVAIL. I'M AT WORK NOW AND FEAR THAT THE BATTERY WILL GO DEAD BEFORE I GET OFF WORK. I JUST HAD THE TRUCK AT GMC 2/6/2021 AND WAS TOLD THAT THEIR WERE NO RECALLS. ALSO, NOTE THAT WHEN THE SCREEN KEPT GOING OUT I TOOK IT T…
Owner-reported narrative. 8,501 miles reported. Look up ODI 11396147 at NHTSA ↗
Owner report 11421278 · 2021-06-17 (June 17, 2021)
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.
Owner-reported narrative. Look up ODI 11421278 at NHTSA ↗
Owner report 11655399 · 2025-04-18 (April 18, 2025)
The contact owns a 2020 GMC Sierra 2500. The contact stated that the vehicle was under NHTSA Campaign Number: 24V797000 (Power Train) and the vehicle was repaired. The contact stated that after the recall repair, the transmission started shifting hard. The vehicle was taken to the dealer, and the contact was informed that the transmission module would reprogram and adjust independently. The contact stated that a week later, while driving approximately 45 MPH, the vehicle started to run rough, and the message engine power reduced was displayed. …
Owner-reported narrative. 125,000 miles reported. Look up ODI 11655399 at NHTSA ↗