AI Damage2020 Cadillac CT6: common problems
Owners of the 2020 Cadillac CT6 filed 11 complaints with NHTSA, most often about powertrain and service brakes. The maker issued 700 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 11
- involving a crash
- 2
- Technical service bulletins (TSB)
- 700
What fails most often
- 1 Powertrain 55% of all complaints
- 2 Service brakes 27% of all complaints
- 3 Forward collision avoidance 18% of all complaints
- 4 Wheels 9% of all complaints
- 5 Structure 9% of all complaints
- 6 Suspension 9% of all complaints
- Powertrain: 6 complaints (55% of all); manufacturer bulletins for this component: 73.
- Service brakes: 3 complaints (27% of all), 1 of them with a crash reported by the owner; manufacturer bulletins for this component: 32.
- Forward collision avoidance: 2 complaints (18% of all), 1 of them with a crash reported by the owner; manufacturer bulletins for this component: 12.
- Wheels: 1 complaints (9% of all); manufacturer bulletins for this component: 37.
- Structure: 1 complaints (9% of all), 1 of them with a crash reported by the owner; manufacturer bulletins for this component: 28.
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 3.6 L · petrol · 6 cyl
- 4.2 L · petrol · turbo · 8 cyl
- automatic, 10-speed
Drive: AWD
Symptoms owners describe
How many of the 11 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 | 6 | 0 | 73 |
| Service brakes | 3 | 1 | 32 |
| Forward collision avoidance | 2 | 1 | 12 |
| Wheels | 1 | 0 | 37 |
| Structure | 1 | 1 | 28 |
| Suspension | 1 | 0 | 14 |
| Equipment | 0 | 0 | 226 |
| Electrical system | 0 | 0 | 157 |
| Engine and cooling | 0 | 0 | 102 |
| Engine | 0 | 0 | 65 |
| Fuel system | 0 | 0 | 22 |
| Tires | 0 | 0 | 19 |
| Steering | 0 | 0 | 16 |
| Backover prevention | 0 | 0 | 14 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
latelyi have had a problem with my back hatch door opening by it self the problem the last time it happen just before i enter a car wash now ive got a 7800 bill to repair it
I have had some instances where when backing up, in a completely empty parking lot or street and the car will brake on its own. There are no posts, trees or any objects like that anywhere nearby to trigger the braking. The marysville (ohio) police department responded to the accident.
The vehicle was shifting harshly and my wheels were experiencing lock up while in motion which was very dangerous. I experienced this on the parkway as well as streets and almost had a few accidents due to this problem. I drive my wife and children in this vehicle. Our safety and lives were put at risk.
The vehicle was towed to the dealer where it was diagnosed with transmission failure. The vehicle was not repaired. The manufacturer informed the contact that the vehicle was out of warranty.
The contact stated that while his wife was driving at an undisclosed speed, the vehicle jerked before slamming into gear. No warning lights were illuminated. In addition, the contact stated that the transmission was shifting rough.
The super cruise self driving feature doesn't work and error messages continuously flash on dashboard. It has been at the dealer since 12/16 (>9 weeks) without any resolution. Calls, emails, posts to cadillac and general motors go unanswered.
Tl* the contact owns a 2020 cadillac ct6. The contact stated that while depressing the brake pedal, there was a loud screeching sound coming from the wheels. The vehicle was taken to woodland cadillac located at 530 quality cir #101, woodland, [ZIP], to be diagnosed.
Car was acquired in february and scraping noise in front brakes was noticed in may. Waited to see if the noise would go away by itself but became louder and took to cadillac dealer, miller cadillac in ellicott city md telephone [phone] on july 30.
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 1,457 of 2,102 model years in the NHTSA data (among the 31% least complained about).
On average one model year of the CT6 has 13 complaints (6 years in the data). This year has 11, about average.
What to check before buying
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Forward collision avoidance. Radar and camera: calibration after bumper or windshield replacement.
- Wheels. Wheel runout, cracks, signs of a wheel strike.
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 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 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 Preliminary information communicates to the field on how to diagnosis a GPS issue with the Telematic…
- This service bulletin provides information on Tire Sidewall Irregularities
- This service bulletin provides information on replacing the intake manifold when the engine is replaced…
This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage.
- This Preliminary Information communication provides information to the technician about vehicles that have…
This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer’s vehicles that exhibit vibration conditions…
- The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle…
The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the customer that it is normal for the delay.
NHTSA lists 700 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 Cadillac CT6?
Owner complaints to NHTSA most often mention: powertrain, service brakes, forward collision avoidance. Total complaints: 11. The most frequent symptoms in complaint texts: jerking, harsh shifts (9%), brakes on its own (phantom braking) (9%), transmission slipping (9%).
How many service bulletins (TSB) were issued for the 2020 Cadillac CT6?
NHTSA lists 700 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 Cadillac CT6 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.