Most common 2020 Cadillac CT6 problems
Share of the 11 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Cadillac CT6 complaints by model year
Best CT6 years: 2018. Years to avoid: 2019. Compare all years →
2020 Cadillac CT6 recalls (2)
Power train › Automatic transmission
General Motors LLC (GM) is recalling certain 2019-2020 Cadillac CT6, 2020-2021 CT4, CT5, and 2020-2022 Chevrolet Camaro vehicles equipped with a 10-speed transmission. The transmission may become damaged internally and cause the wheels to lock-up.
Remedy: Dealers will install transmission control module monitoring software, free of charge. Owner notification letters were mailed April 7, 2025.
Tires › Pressure monitoring and regulating systems
General Motors LLC (GM) is recalling certain 2020 Cadillac CT6 vehicles equipped with dealer-installed accessory 20" x 8.50" wheels (RPO 5JO or SHH). The tire pressure monitoring system (TPMS) sensors use the incorrect wireless radio frequency and cannot illuminate the low pressure warning light when the tire pressure drops…
Remedy: GM will notify owners, and dealers will replace all four TPMS sensors with the correct sensors, free of charge. The recall began December 3, 2019. Owners may contact GM customer service at 1-586-596-1733.
What 2020 Cadillac CT6 owners say
Transmission & drivetrain
The contact owns a 2020 Cadillac CT6. The contact stated while driving 65 MPH, the transmission seized, and the vehicle was coasted over to the right side of the roadway while waiting for tow service. A dealer as contacted. 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 related the failure to NHTSA Campaign Number: 25V148000 (POWER TRAIN); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact was referred to the NHTSA Hotline for assistance. The failure mileage was 98,000. Parts distribution disconnect.
The contact owns a 2020 Cadillac CT6. The contact received notification of NHTSA Campaign Number: 25V148000 (Power Train); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated that the transmission was shifting hard. The dealer was contacted. The manufacturer was not made aware of the issue. The failure mileage was approximately 64,000. VIN tool confirms parts not available.
Brakes
On Friday, November 13, 2020 I was stopped at a stoplight in marysville, ohio. It appeared that traffic started to move, so I took my foot off the brake. Almost immediately the emergency braking feature engaged. While this tends to startle you because it is so abrupt, almost like a head-on collision, I pressed on the brake. The brake did not stop the car. It was similar to when anti-lock braking is engaged. The brakes felt like they were pulsating, so the car continued to move forward until it pressed up against the car in front of me. 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 file number for the police report is 20.01993. …
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. I was told the mechanic could hear the noise but could not identify the source. He called GM and they told him there was tech bulletin #pic6290c instructing the mechanic to tell customer the noise is normal does not affect safety or reliability of the car but would not tell the mechanic the cause of the noise, which is getting worse! However the tech bulletin states the cause was detected and corrected on October 30, 2017! The issue obviously is not corrected and is not going away. I am concerned the car is not safe to drive especially since GM would not tell the technician the cause so I can monitor it. …
2020 Cadillac CT6 engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 3.6L 6-cyl | 10-speed automatic | AWD | 18 / 27 / 21 |
| 4.2L 8-cyl turbo | 10-speed automatic | AWD | 14 / 25 / 17 |
EPA ratings. Class: Large car.
Frequently asked questions
Is the 2020 Cadillac CT6 a good car?
Based on 11 owner complaints filed with NHTSA, the 2020 CT6 rates average: 1.5× as many complaints as a typical year of the CT6 at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2020 Cadillac CT6?
The transmission & drivetrain — 6 complaints, 55% of all complaints for this model year. Next are the brakes (3) and driver assistance (2).
How many recalls does the 2020 Cadillac CT6 have?
There are 2 recalls for the 2020 Cadillac CT6, the most recent from March 6, 2025 (automatic transmission). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Cadillac CT6?
The best years by complaints, compared at the same age, are 2018. Years to avoid or approach with caution: 2019. See the full Cadillac CT6 years comparison.
At what mileage do 2020 Cadillac CT6 problems happen?
The median mileage reported in complaints is about 15,000 miles; 67% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.