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. There were no warning lamps to advise of troubles. I also have some computer problems that are supposed to be addressed. Gm dealer has had my car for four months and have tried to replace valve four times and all four times the part they received was defective and unsuccessful. I have made many calls to GM and they are giving me the run around. Now they want to replace the entire transmission but wanted to use aftermarket part which more than likely is also defective. They are having a hard time obtaining a new transmission and also advised me I would be responsible for the cost of this replacement when they get a new transmission. At this point I am not willing to risk mine or my families life by driving this car after they try to replace transmission. I’m also not willing or able to pay for this repair that was no fault of mine. I am not sure how to proceed in getting them to replace entire vehicle but that is the safest option at this point.
The worst 2020 Cadillac CT6 problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Transmission6
- Brakes3
- Driver assistance2
- Body1
- Suspension1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Transmission6
- Brakes3
- Driver assistance2
- Body1
- Suspension1
- Wheels1
Recalls 2
Power train: automatic transmission
- What is wrong
- 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.
- Risk
- Wheel lock-up while driving increases the risk of a crash.
- Remedy
- Dealers will install transmission control module monitoring software, free of charge. Owner notification letters were mailed April 7, 2025. Owners may contact Cadillac customer service at 1‑800‑333‑4223 or Chevrolet customer service at 1‑800‑222‑1020. GM's number for this recall is N242480630.
Recall number 25V148000 · Recall details
Tires: pressure monitoring and regulating systems
- What is wrong
- 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 below the recommended level. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 138, "Tire Pressure Monitoring Systems."
- Risk
- Drivers may drive the vehicle with low tire pressure without a low tire pressure warning, negatively impacting the vehicle handling and increasing the risk of a crash.
- 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. GM's number for this recall is N192279200.
Recall number 19V731000 · Recall details
Technical service bulletins for the 2020 Cadillac CT6 754
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Special Coverage
- This service bulletin provides information about GM Accessories
- • Improvements to OnStar functionality.
- This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
- Unknown or other
- PI to help diagnose A/C concern
- Unknown or other
- Unknown or other
- Unknown or other
- Unknown or other
What 2020 Cadillac CT6 owners say
Most recent owner complaints, unedited.
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 the federal safety agency 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 federal safety agency Hotline for assistance. The failure mileage was 98,000. Parts distribution disconnect.
The contact owns a 2020 Cadillac CT6. The contact received notification of the federal safety agency Campaign Number: 25V148000 (Power Train); however, the part to do the recall repair was unavailable. 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 vehicle was taken to the dealer; however, the vehicle was not diagnosed or repaired. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated that the failure persisted. The manufacturer was made aware of the issue. The failure mileage was unknown. VIN tool confirms parts not available.
The contact owns a 2020 Cadillac CT6. The contact received notification of the federal safety agency 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.
See attached document for complaint.
The contact owns a 2020 Cadillac CT6. The contact received notification of the federal safety agency 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 manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.
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
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. Dealer tells me cadillac engineers from corporate come and go with no solution. I've made 2 payments to date without my car. I notified gm financial I will no longer make payments on a car I do not have. Also no response.
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. I was not cited because I was in essence unable to stop the car. There was plenty of time to stop the car as I don't believe I pressed the accelerator at all. The car currently has a warning appearing that indicates driver assist system needs service. I'm not sure it's safe to operate this vehicle since this happened while in traffic.
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, ca 95776, to be diagnosed. The contact was informed that the front radial arms were faulty and needed to be replaced. The radial arms were replaced however, the failure persisted. The contact indicated that there was a black greasy material coming from the brakes and covered the wheels. The cause of the failure was determined it was the brake shields . The manufacturer was notified of the failure. The failure mileage was 100.*dt*jb*dt
Compare the 2020 Cadillac CT6
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Questions about the 2020 Cadillac CT6
Is the 2020 Cadillac CT6 reliable?
Owners have filed 11 complaints about the 2020 Cadillac CT6, close to a typical CT6 model year.
What is the 2020 Cadillac CT6 year score?
The 2020 Cadillac CT6 scores 75 out of 100 (average). The score compares it with the other model years of the Cadillac CT6: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.
What is the most common problem with the 2020 Cadillac CT6?
Transmission and drivetrain, with 6 complaints. Next is brakes (3).
How many recalls does the 2020 Cadillac CT6 have?
2 recalls, covering power train and tires.
Was there a recall on the 2020 Cadillac CT6 transmission?
Yes, 1 recall: 25V148000. Check your VIN to see if your car still needs the free repair.
What year does the Cadillac CT6 have bad transmission?
The Cadillac CT6 model years with the most transmission complaints are 2019 (14 complaints) and 2017 (10 complaints).
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