YearToAvoid

2020 Cadillac CT6 Problems, Recalls & Reliability

Verdict

Caution

Complaint Index

50/100

#3 most-complained of 5 CT6 years

The 2020 Cadillac CT6 has a Complaint Index of 50, ranking 3rd worst of 5 model years, with a Caution verdict. NHTSA lists 11 complaints and 2 recalls, led by Transmission & Powertrain issues (55% of complaints).

Complaints
11
Recalls
2
Crashes / fires
1 / 0
Injuries / deaths
0 / 0
NHTSA overall rating
Not rated
EPA combined MPG
19
16 city / 26 hwy

Top 2020 Cadillac CT6 problems

NHTSA owner complaints by component group. Groups with 15+ complaints have their own page.

  1. Transmission & Powertrain6 (55%)
  2. Brakes3 (27%)
  3. Collision Avoidance & Cameras2 (18%)
  4. Suspension, Wheels & Tires2 (18%)
  5. Other1 (9%)
  6. Structure & Body1 (9%)

What owners report

  • Owners report the automatic emergency braking system engaging abruptly at low speed and the brakes then failing to stop the car, in one case leading to a crash.
  • Front brakes reportedly develop a scraping or screeching noise that dealers have struggled to diagnose, in one case traced to faulty front radial arms.
  • Multiple owners describe the 10-speed transmission jerking, slamming into gear, shifting hard, or seizing entirely at highway speed, sometimes tied to the open 25V148000 recall with parts unavailable.
  • One owner reported harsh shifting paired with wheel lock-up while driving, calling it a near-accident situation.
  • A rear hatch reportedly opened on its own, in one case right before entering a car wash.
2020 Cadillac CT6 complaints: complaints filed per month4Aug 2020Feb 2021Apr 2025Jun 2025Sep 2025
15 complaints filed with NHTSA from Aug 2020 to Sep 2025; peak Nov 2020 (4).

2020 Cadillac CT6 recalls

2 NHTSA recall campaigns list this model year.

  1. NHTSA 25V148000Mar 6, 2025Transmission & Powertrain90,081 vehicles

    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.

    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.

  2. NHTSA 19V731000Oct 15, 2019Suspension, Wheels & Tires81 vehicles

    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 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.

2020 Cadillac CT6 fuel economy and fuel cost

City
16 MPG
Highway
26 MPG
Combined
19 MPG
Annual fuel cost (EPA)
$3,900
15,000 mi/yr
Fuel
Regular
Current regular gas
$4.32/gal
national avg.

EPA figures; median across configurations of this model year. Estimate your own cost with the fuel cost calculator.

2020 compared with other CT6 years

Complaint Index by model year (0 = fewest issues, 100 = most)025507510020162017201820192020
Complaint Index: 0 = fewest issues, 100 = most, relative to other years of this model. Avoid Caution Good Best
YearVerdictIndexComplaintsRecallsMPG
2018Best09023
2019Avoid7517421
2020Caution5011219

All Cadillac CT6 years: best and worst →

Frequently asked questions

Is the 2020 Cadillac CT6 reliable?
NHTSA data gives the 2020 CT6 a Complaint Index of 50 and a Caution verdict, ranking 3rd worst out of 5 model years tracked. It has fewer complaints (11) than 2017 or 2019 but a higher index than the 2017 or 2018 models.
What are the main problems with the 2020 Cadillac CT6?
Transmission & Powertrain issues make up 55% of complaints, followed by Brakes at 27%. There are also reports involving Collision Avoidance & Cameras and Suspension, Wheels & Tires.
Does the 2020 Cadillac CT6 have a transmission recall?
Yes. Recall 25V148000 covers the 10-speed transmission on 2019-2020 CT6 vehicles due to potential internal damage; GM's remedy is a transmission control module software update.
Which Cadillac CT6 model years should be avoided?
Based on NHTSA data, 2016 and 2019 are rated Avoid with Complaint Index scores of 100 and 75. The 2018 model year scores lowest at 0 and is rated Best.
What is the fuel economy of the 2020 Cadillac CT6?
The EPA rates the 2020 CT6 at 19 mpg combined (16 city / 26 highway), with an estimated annual fuel cost of $3,900.

Sources: NHTSA Office of Defects Investigation complaint and recall databases; U.S. EPA fuel economy data; NHTSA 5-Star Safety Ratings. Complaints are unverified owner reports.

Data updated Sep 24, 2026. Read the methodology and data sources. The Complaint Index is based on NHTSA owner complaints and recalls; it is not a reliability rating.