2020 Cadillac CT6 reliability

Is it reliable?

The 2020 Cadillac CT6 has 11 complaints with NHTSA after 7 years, or 1 per year. That is more complaints per year than most CT6 years here — over the median of the other years, which is 1. NHTSA has 2 recalls on file, including Automatic transmission and Tire pressure monitoring.

2016 Cadillac CT6 — Photo by Greg Gjerdingen from Willmar, USA, resized from the original. Wikimedia Commons CC BY 2.0

Complaints

Per year

Recalls

Years on the road

What owners report

The complaints owners file most often name Powertrain (6 of 11), then Service brakes (3) and Forward collision avoidance (2). The most filings arrived in 2025 (7 of 11). Those filings include 2 that report a crash.

Next to 2019

The 2019 CT6 has 17 complaints, 1 per year. The 2020 has more complaints per year than the 2019.

The complaint rate is complaints filed in this year’s first 3 years on the road, divided by however many of those years have passed. Recalls are a separate count. The numbers are for the US-market 2020 Cadillac CT6. How we count. Data as of 2026-10-16.

Recalls (2)

Recall powertrain, automatic transmission 2025-03-06 · NHTSA campaign 25V148000

Summary 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. 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 tires, tire pressure monitoring 2019-10-15 · NHTSA campaign 19V731000

Summary 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."

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.

Complaints by component (11 total)

Powertrain

Service brakes

Forward collision avoidance

Structure

Suspension

Wheels

Crash-flagged

Fire-flagged

Injury reports

Death reports

Complaints filed per year

Excerpts from recent NHTSA complaint filings

"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.…"
Powertrain, Wheels · filed 2025-09-30
"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…"
Powertrain · filed 2025-07-15
"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 while his…"
Powertrain · filed 2025-06-17
"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…"
Powertrain · filed 2025-06-10
"See attached document for complaint."
Powertrain · filed 2025-05-22

NHTSA crash ratings

Version	Overall	Front	Side	Rollover
2020 Cadillac CT6 4 DR AWD	Not rated	Not rated	Not rated	Not rated

Stars are how this vehicle did in NHTSA crash tests. They are a safety result, separate from the complaint record. Not rated means that test was not run for this version.

Fuel economy

Trim	Engine	Transmission	Drive	City	Hwy	Combined	Annual fuel cost
CT6 all-wheel drive	4.2L, 8-cyl	Automatic (10-speed)	All-wheel drive	14	25	17 MPG	$4700
CT6 all-wheel drive	3.6L, 6-cyl	Automatic (10-speed)	All-wheel drive	18	27	21 MPG	$3100

Specs and fitment

First generation, 2016–2020

Body styles Sedan

Oil 5W-30 (all temps); 0W-30 below -29°C (2.0L turbo example) , 5 qt capacity

Tire size 235/50R18, 245/45R19, 245/40R20 (trim-dependent) front / 235/50R18, 245/45R19, 245/40R20, 265/45R18 (trim-dependent) rear

Known issues for this generation

Recall 18V-437 covers certain 2016-2018 Cadillac CT6 vehicles: excess structural adhesive on the inboard child-seat anchorage bars may prevent a child restraint from attaching properly, which can increase injury risk in a crash. Dealers remove excess adhesive and inspect the anchorage bars. Recall 21V-759 covers certain 2016-2017 CT6 vehicles: the park/position lights may be excessively bright, so the vehicles fail to comply with federal lighting standards; dealers replace the affected lamp assemblies or reprogram as specified in the campaign.

Compare

Previous year 2019 Cadillac CT6 See every Cadillac CT6 model year →

Frequently asked questions

Is the 2020 Cadillac CT6 reliable?

What are common problems with a 2020 Cadillac CT6?

Is the 2020 Cadillac CT6 more reliable than the years next to it?

The 2019 CT6 has 17 complaints, 1 per year. The 2020 has more complaints per year than the 2019.

Has the 2020 Cadillac CT6 been recalled?

The 2020 Cadillac CT6 has 2 recalls on file with NHTSA. See the recalls table on this page for dates, components, and remedies.

How many complaints have owners filed about the 2020 Cadillac CT6?

Owners have filed 11 complaints about the 2020 Cadillac CT6 with NHTSA.

What mpg does a 2020 Cadillac CT6 get?

EPA-rated combined fuel economy for the 2020 Cadillac CT6 is 19 MPG. See the fuel economy table on this page for city and highway figures by engine and transmission.

What oil does a Cadillac CT6 use?

Common specs cite 5W-30 (0W-30 below −29 °C on some turbo engines) with about 5 qt including filter; confirm for your engine code.

What tire sizes fit the Cadillac CT6?

OE sizes include 235/50R18, 245/45R19, and 245/40R20 with some trims using a wider rear; check the door placard.

What recalls affect the Cadillac CT6?

Recall 18V-437 covers certain 2016-2018 CT6 models for excess adhesive on inboard child-seat anchor bars; 21V-759 covers certain 2016-2017 CT6 vehicles for overly bright park/position lamps.