AI Damage2020 GMC Yukon: common problems
Owners of the 2020 GMC Yukon filed 37 complaints with NHTSA, most often about powertrain and engine. The maker issued 729 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 37
- Technical service bulletins (TSB)
- 729
What fails most often
- 1 Powertrain 41% of all complaints
- 2 Engine 32% of all complaints
- 3 Service brakes 8% of all complaints
- 4 Electrical system 5% of all complaints
- 5 Engine and cooling 3% of all complaints
- 6 Wheels 3% of all complaints
- 7 Fuel system 3% of all complaints
- 8 Tires 3% of all complaints
- Powertrain: 15 complaints (41% of all); manufacturer bulletins for this component: 107.
- Engine: 12 complaints (32% of all); manufacturer bulletins for this component: 71.
- Service brakes: 3 complaints (8% of all); manufacturer bulletins for this component: 17.
- Electrical system: 2 complaints (5% of all); manufacturer bulletins for this component: 134.
- Engine and cooling: 1 complaints (3% of all); manufacturer bulletins for this component: 123.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 5.3 L · petrol · 8 cyl
- 6.2 L · petrol · 8 cyl
- automatic, 6-speed
- automatic, 10-speed
Drive: RWD, 4WD
Symptoms owners describe
How many of the 37 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Powertrain | 15 | 0 | 107 |
| Engine | 12 | 0 | 71 |
| Service brakes | 3 | 0 | 17 |
| Electrical system | 2 | 0 | 134 |
| Engine and cooling | 1 | 0 | 123 |
| Wheels | 1 | 0 | 35 |
| Fuel system | 1 | 0 | 21 |
| Tires | 1 | 0 | 21 |
| Backover prevention | 1 | 0 | 6 |
| Electronic stability control | 1 | 0 | 5 |
| Fuel/propulsion system | 1 | 0 | 5 |
| Seat belts | 1 | 0 | 3 |
| Forward collision avoidance | 1 | 0 | 2 |
| Equipment | 0 | 0 | 212 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
Afterwards we noted a shudder and thought they made error or forgot to tighten something. Took truck back in for additional fluids and they had driveline associate drive. He said torque converter was going bad, and also warning these transmissions go bad unexpectedly and lock up. We have GMPP EXTENDED WARRANTY.
We just purchased our Yukon from a dealership in February (2/7/26) and it was diagnosed with premature failure of at least one AFM valve lifter as it is causing engine misfires, shaking and stalling on 7/30/26. We just hit 67,000 miles on the odometer so we are just beyond the warranty coverage.
The contact stated that while driving at various speeds, the vehicle jerked and the transmission malfunctioned, causing the wheels to lock up and the check engine warning light to illuminate. The vehicle was driven to a local dealer who diagnosed that the transmission clutch and pressure control solenoid had failed.
Complete transmission failure at 82,000 miles. Well maintained vehicle, not used for towing or heavy hauling. Required complete replacement. Traveling at highway speeds and-according to repair facility- valve failure caused transmission to overheat a stripped gears, causing complete failure.
Issue with the trailer brake system keeps coming up on my dash. I know a lot of other people have had the same issue keeps dinging will not stop causes me to get distracted while driving. Unable to use other features because of this distraction and safety issue.
I had an incident in my 2020 GMC Yukon, where the forward collision crash alert went off and there was total loss of brakes. The brake pedal went to the floor. After the crash alert ended, the brakes returned. This happened on the highway and could have turned into a disastrous event.
The check engine light started going on and off a few months after purchasing the vehicle. When I called a mechanic he stated that I should wait until the light is on and then bring in the vehicle.
The contact stated that while driving at an undisclosed speed, the check engine warning light was illuminated. The vehicle was taken to the residence, the contact exited the vehicle and discovered white smoke coming from the exhaust and started to smell coolant and then discovered that the coolant level was low.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 994 of 2,102 model years in the NHTSA data (top 47% most complained about).
On average one model year of the Yukon has 130 complaints (12 years in the data). This year has 37, below average.
What to check before buying
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it
- This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance
- PI to help diagnose A/C concern
- This PI provides diagnostic tips for diagnosing electric trailer brakes issues
- This preliminary information communicates information about how to determine if a wheel and tires size…
- This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a…
This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.
- This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic…
This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic module with no DTC'ss
- This preliminary information communicates an issue with aftermarket LED headlights causing IPC warning…
This preliminary information communicates an issue with aftermarket LED headlights causing IPC warning messages and MIL along with several low speed lan DTCs.
- This PI advised dealer technicians of possible causes of diesel fuel contamination in gasoline powered…
This PI advised dealer technicians of possible causes of diesel fuel contamination in gasoline powered vehicles and advises of warranty direction.
- This PI Communications information on an alternative product dealers can use to perform 19-NA-255
Wax Coating on Frame Peeling, Metal Shows Corrosion/Rusting due to issue with getting product from current supplier listed in the bulletin.
- This Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic…
- This Preliminary information communicates an issue with a service keyless entry message caused by…
This Preliminary information communicates an issue with a service keyless entry message caused by aftermarket door handle covers and they should be removed.
NHTSA lists 729 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2020 GMC Yukon?
Owner complaints to NHTSA most often mention: powertrain, engine, service brakes. Total complaints: 37. The most frequent symptoms in complaint texts: warning lights, check engine (35%), transmission slipping (19%), jerking, harsh shifts (16%).
How many service bulletins (TSB) were issued for the 2020 GMC Yukon?
NHTSA lists 729 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2020 GMC Yukon from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2020 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.